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Cui L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cui L.,University of Chinese Academy of Sciences | Yan C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chemical Engineering Transactions | Year: 2016

Cavity Ring-Down Spectrometer (CRDS) (Romanini et al., 1997) has been widely used in the fields of atmospheric chemistry, meteorology, air pollution and greenhouse gas emission, ecological environment and ecological hydrology research and public safety assurance. However, in order to maximize the measurement sensitivity of the target analyte of the cavity ring down spectrometer, the absorption measurement should be selected at the target line absorption peak (Kevin K. Lehmann et al., 1996). In addition, it should be noted that the interference of absorption lines of the same or other species should be reduced, in order to achieve a higher accuracy detection of the instrument that improving the spectral accuracy become more critical (Altshuler et al., 1977). In the paper, we have considered the existence of the self-conjugate rays in the resonator which is consisted of a number of mirrors and including spherical mirrors, the effect of spherical mirror misalignment in ring resonators was investigated. Then by utilizing the optical path turning reflection matrix, and the influence that caused by both the displacements of a spherical mirror and plane mirror in a nonplanar ring resonator have been obtained, and given the relation of the error transmission in both azimuth and pitch direction. Copyright © 2016, AIDIC Servizi S.r.l.


Zhao B.,Fudan University | Wang F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen H.,Fudan University | Zheng L.,Fudan University | And 3 more authors.
Advanced Functional Materials | Year: 2017

Highly crystallized ZnO-Ga2O3 core-shell heterostructure microwire is synthesized by a simple one-step chemical vapor deposition method, and constructed into a self-powered solar-blind (200-280 nm) photodetector with a sharp cutoff wavelength at 266 nm. The device shows an ultrahigh responsivity (9.7 mA W-1) at 251 nm with a high UV/visible rejection ratio (R251 nm/R400 nm) of 6.9 × 102 under zero bias. The self-powered device has a fast response speed with rise time shorter than 100 μs and decay time of 900 μs, respectively. The ultrahigh responsivity, high UV/visible rejection ratio, and fast response speed make it highly suitable in practical self-powered solar-blind detection. Additinoally, this microstructure heterojunction design method would provide a new approach to realize the high-performance self-powered photodetectors. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Fang R.,University of Rochester | Fang R.,Chongqing University of Posts and Telecommunications | Vorobyev A.,University of Rochester | Guo C.,University of Rochester | Guo C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Light: Science and Applications | Year: 2017

Despite extensive studies of femtosecond laser-material interactions, even the simplest morphological responses following femtosecond pulse irradiation have not been fully resolved. Past studies have revealed only partial dynamics. Here we develop a zero-background and high-contrast scattered-light-based optical imaging technique through which we capture, for the first time, the complete temporal and spatial evolution of the femtosecond laser-induced morphological surface structural dynamics of metals from start to finish, that is, from the initial transient surface fluctuations, through melting and ablation, to the end of resolidification. We find that transient surface structures first appear at a delay time on the order of 100 ps, which is attributed to ablation driven by pressure relaxation in the surface layer. The formation dynamics of the surface structures at different length scales are individually resolved, and the sequence of their appearance changes with laser fluence is found. Cooling and complete resolidification, observed here for the first time, are shown to occur more slowly than previously predicted by two orders of magnitude. We examine and identify the mechanisms driving each of these dynamic steps. The visualization and control of morphological surface structural dynamics not only are of fundamental importance for understanding femtosecond laser-induced material responses but also pave the way for the design of new material functionalities through surface structuring. © The Author(s) 2017.


Jing Y.-M.,Nanjing University | Zheng Y.-X.,Nanjing University | Zheng Y.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zuo J.-L.,Nanjing University
RSC Advances | Year: 2017

A series of phosphorescent organic light-emitting diodes (OLEDs) with single or double light-emitting layer(s) were fabricated using a green iridium(iii) complex Ir(BTBP)2POP containing 2′,6'-bis(trifluoromethyl)-2,4′-bipyridine (BTBP) cyclometalated ligand and 2-(5-phenyl-1,3,4-oxadiazol-2-yl)phenol (POP) ancillary ligand. The single light-emitting layer devices with the structure of ITO/MoO3 (5 nm)/TAPC (1,1-bis[4-(di-p-tolylamino)phenyl]cyclohexane, 30 nm)/mCP (N,N′-dicarbazolyl-3,5-benzene, 5 nm)/Ir(BTBP)2POP:PPO21 (3-(diphenylphosphoryl)-9-(4-(diphenylphosphoryl)phenyl)-9H-carbazole, 8 wt%, 10 nm)/TmPyPB (1,3,5-tri(m-pyrid-3-yl-phenyl)benzene, 40 nm)/LiF (1 nm)/Al (100 nm) achieved the highest luminance, current efficiency, power efficiency and external quantum efficiency (EQE) up to 47 599 cd m-2, 86.5 cd A-1, 52.2 lm W-1 and 31.0%, respectively. Furthermore, the double EML device with the structure of ITO/MoO3 (5 nm)/TAPC (30 nm)/mCP:Ir(BTBP)2POP (8 wt%, 10 nm)/PPO21:Ir(BTBP)2POP (8 wt%, 10 nm)/TmPyPB (40 nm)/LiF (1 nm)/Al (100 nm) obtained a higher maximum luminance of 49 139 cd m-2 and slightly lower maximum current efficiency, power efficiency and EQE of 75.8 cd A-1, 51.7 lm W-1 and 27.2%, respectively, with lower turn-on voltage. This research suggested that not only the doping concentration but also the thickness of the emissive and electron transport layers strongly affect the EL performances. © The Royal Society of Chemistry.


Liu H.,Jilin University | Wu Z.,Jilin University | Shao J.,Jilin University | Yao D.,Jilin University | And 5 more authors.
ACS Nano | Year: 2017

CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) are potential emitting materials for illumination and display applications, but toxic Pb is not environment- and user-friendly. In this work, we demonstrate the partial replacement of Pb with Mn through phosphine-free hot-injection preparation of CsPbxMn1-xCl3 QDs in colloidal solution. The Mn substitution ratio is up to 46%, and the as-prepared QDs maintain the tetragonal crystalline structure of the CsPbCl3 host. Meaningfully, Mn substitution greatly enhances the photoluminescence quantum yields of CsPbCl3 from 5 to 54%. The enhanced emission is attributed to the energy transfer of photoinduced excitons from the CsPbCl3 host to the doped Mn, which facilitates exciton recombination via a radiative pathway. The intensity and position of this Mn-related emission are also tunable by altering the experimental parameters, such as reaction temperature and the Pb-to-Mn feed ratio. A light-emitting diode (LED) prototype is further fabricated by employing the as-prepared CsPbxMn1-xCl3 QDs as color conversion materials on a commercially available 365 nm GaN LED chip. © 2017 American Chemical Society.


Zhou L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2017

A new hybrid reliability model is presented for the case that truncated probabilistic variables and non-probabilistic variables exist simultaneously in engineering. Based on the new hybrid reliability model and reliability index assessment (RIA) method, a nested loop hybrid reliability-based optimization model is also presented. Modified ST-Powell optimization algorithm with better search strategy is used to search the optimal values of design variables in the out-loop. Modified limit step length iteration algorithm, which can ensure convergence, is used to solve the new hybrid reliability index in the inner-loop. Numerical examples show that the global optimization rate of the modified ST-Powell optimization algorithm with better search strategy can be promoted significantly, and the validity of hybrid reliability-based optimization model searched by the algorithm presented in this paper is proved. The algorithm can obtain the optimal values for hybrid reliability-based optimization model with high nonlinear limit state function. The algorithm presented in this paper has a good adaptability to hybrid reliability-based optimization problems of engineering structure. © 2017, Press of Chinese Journal of Aeronautics. All right reserved.


Cao Z.,Changchun University of Science and Technology | Cao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fu Y.,Changchun University of Science and Technology
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2017

The influence of background stray light can not be ignored in the high precision PST test. In order to improve the precision of the PST test, a high performance light trap system which can effectively suppress the background stray light was developed. The quantitative mathematical relationship between the main design parameters and the test error of PST was given based on the theory of the PST test and the theory of optical radiation transfer. The design idea of the light trap was proposed, which was fully controllable in the scattering path and greatly increased the scattering times to the imaging field of view. Through the simulation comparison experiment of some light trap models, the superiority of the design ideas and the model was verified. The result show that, when a light trap with diameter of 20 m is used for the PST test to an optical system with diameter of 2 m and size of 2.8 m ×3.5 m ×11 m, the testing error can be as small as 1.49×10-10, it is reduced by about 4 orders of magnitude compared with the test system without light trap under the same experimental space, and reduced by about 2 orders of magnitude compared with the existing light trap schemes under the same experimental space. The light trap can be used to the high precision PST for the large space telescope. © 2017, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.


Xia M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qin C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | He S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Jiangsu Daxue Xuebao (Ziran Kexue Ban)/Journal of Jiangsu University (Natural Science Edition) | Year: 2017

In order to test the spacecraft microvibration performance under different conditions at low and ultralow frequency, a six-dimension microvibration test system was designed with piezoelectric sensor as core. The software was designed to realize real-time acquisition analysis and sensor signals processing in space with calibration, and the six-dimension force was obtained at last. The working principle and the dynamic calibration method of test system were introduced, and the test system was also simulated and tested. The results show that the relative error of the first five natural frequencies is within 5%, and the first order is more than 400 Hz. The test resolution of force and torque can respectively reach 0.1 N and 0.01 N·m with SNR more than 10. The relative error of six components is within 7% in dynamic testing at the frequency range of 0 to 400 Hz. © 2017, Editorial Department of Journal of Jiangsu University. All right reserved.


Qin W.,Nankai University | Yang J.,Nankai University | Yang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Surface Science | Year: 2017

We report a new one-step maskless method to fabricate high-order nanoarray metal structures comprising periodic grooves and particle chains on a single-crystal Cu surface using femtosecond laser pulses at the central wavelength of 400 nm. Remarkably, when a circularly polarized infrared femtosecond laser pulse (spectrally centered at 800 nm) pre-irradiates the sample surface, the geometric dimensions of the composite structure can be well controlled. With increasing the energy fluence of the infrared laser pulse, both the groove width and particle diameter are observed to reduce, while the measured spacing-to-diameter ratio of the nanoparticles tends to present an increasing tendency. A physical scenario is proposed to elucidate the underlying mechanisms: as the infrared femtosecond laser pulse pre-irradiates the target, the copper surface is triggered to display anomalous transient physical properties, on which the subsequently incident Gaussian blue laser pulse is spatially modulated into fringe-like energy depositions via the excitation of ultrafast surface plasmon. During the following relaxation processes, the periodically heated thin-layer regions can be transferred into the metastable liquid rivulets and then they break up into nanodroplet arrays owing to the modified Rayleigh-like instability. This investigation indicates a simple integrated approach for active designing and large-scale assembly of complexed functional nanostructures on bulk materials. © 2017 Elsevier B.V.


Yang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Z.,Jilin University | Guan Y.,Jilin University
Signal Processing | Year: 2017

Image deconvolution is still to be a challenging ill-posed problem for recovering a clear image from a given blurry image, when the point spread function is known. Although competitive deconvolution methods are numerically impressive and approach theoretical limits, they are becoming more complex, making analysis, and implementation difficult. Furthermore, accurate estimation of the regularization parameter is not easy for successfully solving image deconvolution problems. In this paper, we develop an effective approach for image restoration based on one explicit image filter - guided filter. By applying the decouple of denoising and deblurring techniques to the deconvolution model, we reduce the optimization complexity and achieve a simple but effective algorithm to automatically compute the parameter in each iteration, which is based on Morozov's discrepancy principle. Experiments manifest that our algorithm is effective on finding a good regularization parameter, and the proposed algorithm outperforms many competitive methods in both ISNR and visual quality. © 2017 Elsevier B.V.


Peng S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Gao S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Miao E.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

This paper proposes a method to measure hexahedron vertical error based on wavefront interferometer and collimator. The setup of the measurement system and measurement steps is described. Comparing the vertical error of the same hexahedral surface adjacent measured by coordinate measurement machine, the validity of the measurement method is verified. Then not only the verticality error, but also form and shape error data of the two measured surface can be derived. The verticality error of adjacent surface is measured by the combination measurement method. Then surface figure error data for the two surfaces is measured by wavefront interferometer. The form and shape error data of one surface relative to the other can be obtained by added the verticality error to the surface figure error. This is very important in the part's error correction machining process. The effectiveness of the processing method has been verified by experiment. This method can achieve high measurement accuracy of 0.5″ and can be extended to high-precision shape and position errors measurement for other polyhedral parts. © 2016 SPIE.


Zhou D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jing P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhai Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Chemistry of Materials | Year: 2017

Aggregation-induced luminescence quenching of carbon dots (CDots) is the main obstacle for their applications in the solid state. Herein, we report a method to produce strongly luminescent CDots@silica composite gels with highly concentrated emitting centers, where the gelation of tetraethyl orthosilicate is initiated by the surface hydroxyl groups of CDots. The key feature of this approach is to prevent both the collision between high concentrated CDots in gelating solution and their aggregation upon drying. The resultant CDots@silica composite xerogel exhibits both high CDots loading fraction (19.2 wt %) and photoluminescence quantum yields (>40%). © 2017 American Chemical Society.


Xu D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu D.,University of Chinese Academy of Sciences | Lin G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xue Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Applied Optics | Year: 2017

Grating spectrometer is one of the most important instruments in studying solar radiation, and accuracy of its wavelength scanning mechanism determines final measurement result. Taking errors from both grating parameters and machining dimensions into consideration, this paper analyzes comprehensive accuracy of wavelength scanning mechanism which is made up of screw and swing. Based on dispersive principle of concave grating, relationships between wavelength λ and displacement of end swing along direction of screw x, swing length l, grating constant g and half angle between incident light and diffraction light δ are derived. Then derivatives of equation are obtain, and wavelength errors are calculated between 650 nm and 2 400 nm and should be no more than ±1.227 nm according to principle of errors stack. Then results are tested on prototype. Fitted curve of wavelength and error can be obtained when taking mercury lamp as light source, and can be checkeded when taking helium neon laser as light source. Results prove correctness of theorectical calculation method, and provide theory evidence in choosing components. © 2017, Editorial Board, Journal of Applied Optics. All right reserved.


Ju G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ju G.,University of Chinese Academy of Sciences | Yan C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Gu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Optics | Year: 2017

This paper investigates the alignment strategies for eliminating the field-dependent aberrations of the class of large three-mirror anastigmatic (TMA) space telescopes with a segmented primary mirror (PM) like the James Webb Space Telescope (JWST) in the multi-field fine-phasing process based on the framework of nodal aberration theory. During the single-field (on-axis field) fine-phasing process, the individual segment tip, tilt, and piston errors, as well as the de-space of the secondary mirror, are well corrected, and the PM is also adjusted to compensate for those aberrations induced by the misalignments of other mirrors at the center of the science field of view. However, interrogating off-axis field points can reveal the presence of large wavefront errors due to mirror misalignments. Eliminating these field-dependent aberrations is the main goal of the multi-field fine-phasing process. This paper first presents an analytic study on an established alignment strategy used for eliminating the field-dependent aberrations. While it is demonstrated that this alignment strategy has the ability to reduce the field dependency of the wavefront errors, it will, however, also be revealed that this strategy still exhibits some problems, and its alignment efficiency is low. Then, a new alignment strategy with higher alignment efficiency is further proposed. Detailed simulations with a TMA telescope that has similar parameters with the JWST are performed to illustrate the efficiency and rationality of the proposed strategy. This work can not only contribute to an in-depth understanding of the multi-field fine-phasing process, but also present a possibility to improve the efficiency of this process. © 2017 Optical Society of America.


He W.,Nankai University | Yang J.,Nankai University | Yang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Applied Physics | Year: 2017

Ultrafast non-equilibrium dynamics on the surface of a 4H-SiC crystal is experimentally investigated with time-delayed copropagating two femtosecond laser pulse trains of different linear polarizations. Rippled nanostructures are produced by this irradiation, and the alignment “slant” angle of the ripples is related to the polarizations. With varying time delays between the two laser pulses, this slant angle is found to change. In the first 10 ps, the slant quickly rotates in the direction associated with the polarization of the second incident laser pulse, but then abruptly freezes to a steady offset angle. A physical model is proposed to explain the underlying mechanisms. The first laser pulse produces a transient grating-like modulation of the dielectric constant on the surface, with which the second laser pulse interacts. Because competing fast (Auger) and slow (thermal) relaxation processes reduce the initially induced grating's dielectric constant difference, the vector sum of this partially evolved grating with the second laser pulse's interaction results in the observed slant rotation time dependence. This experiment is straightforward, conceptually simple, and utilizes commercial equipment. The time-resolved slanting of the ripple orientation provides an alternative description of the spatiotemporal evolution of a superheated semiconductor surface. © 2017 Author(s).


He W.,Nankai University | Yang J.,Nankai University | Yang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guo C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guo C.,University of Rochester
Optics Express | Year: 2017

The control of laser-induced periodic ripple microstructures on 4H-SiC crystal surface is studied using temporally delayed collinear three femtosecond laser pulse trains linearly polarized in different directions. The ripple orientation appears to develop independent of the individual laser polarizations and exhibits non-monotonical change with variable time delays, whose variation tendency is also affected by the polarization intersection angles. Remarkably, the ripple period is observed to transfer from high- to low-spatialfrequency regions, accompanied by distinctly improved morphological uniformity and clearness. The results are satisfactorily interpreted based on a physical model of the surface wave excitation on a transient index metasurface, which is confirmed by further experiments. Our investigations indicate that transient noneqilibrium dynamics of the material surface provides an effective way to manipulate the laser-induced microstructures. © 2017 Optical Society of America.


Bi L.,Changchun University of Science and Technology | Di X.-Q.,Changchun University of Science and Technology | Zhang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings - 2016 9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics, CISP-BMEI 2016 | Year: 2016

In this paper, we focus on how to make use of K-PSO(Particle Swarm Optimization) algorithm to improve efficiency of the ontology modularization method. As a bridge of man-machine semantic interaction, ontology has an important status of logic basis of semantic realization and the upper expression of the metadata in the frame of the semantic web. But relative to the rich ontology resources, the application of specific network based on ontology auxiliary is relatively less. In order to solve this problem, we propose the ontology modularization method based on the K-PSO algorithm to make large-scale ontology play an important role in the organization of network information. Ontology modularization method proposed in this paper converts the problem of large-scale and intractable ontology semantic extraction into the internal dynamic extraction of ontology modules, and realizes the optimization semantic clustering of ontology modules. This method can effectively solve the actual application problems of ontology in the network information system based on semantic. Through a number of experiments, it shows that the method and framework to solve the problem in this paper is feasible, versatile and expansible. Compared with the classical clustering method, this method shows a better performance, which can use the particle swarm optimization algorithm to realize module clustering. © 2016 IEEE.


Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yue S.,Changchun Normal University | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fan D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Inorganica Chimica Acta | Year: 2012

In this paper, we report a series of [Cu(N-N)(P-P)]BF 4 complexes based on two phosphorous ligands and three 1,10-phenanthrolin derived diimine ligands, including their syntheses, characterizations, crystal structures. Their photophysical properties were experimentally measured and theoretically analyzed by time-dependent density functional theory (TD-DFT). It is found that the introduction of too many fused phenyl rings into diimine ligand leads to luminescence absence of corresponding [Cu(N-N)(P-P)] + complexes at room temperature. A detailed analysis suggests that the thermal activated electron-configuration transformation between the [Cu(N-N)(P-P)] + triplet metal-to-ligand-charge-transfer ( 3MLCT) state and the lowest lying excited state of its diimine ligand ( 3LC) is responsible for the luminescence quenching. © 2011 Elsevier B.V. All rights reserved.


Zhu M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

To meet the demand for stars detection by all-time optical measure equipment in the ship, and remove the problem of observable stars in the daytime by TV measurement as well as keep inertial navigation equipment emending its direction continuously, so that Space Tracking, Telemetering and Commanding ships "YUAN WANG" can realize their sophisticated measuring and tracking, the technique of "real-time variable multi-levels spectrum filtering", which can distinguish dark and small star target from the bright background of the sky, "the algorithm of dark and small target's stable recognition", which realizes quick and stable targets recognition and tracking, and "the methods in software radio design", which realizes the composition of the processing system and the application of the algorithm are adopted. The optical measure equipment can detect the stars of magnitude 4.5 or even bigger, and the amount of stars that can be detected in the daytime can reach 250 or more, based on that optical equipment's aperture equals 180 mm and its focal length equals 3000 mm. The ability of maximum grades of star detection in the daytime can reach the grades in night, which expandes working ability of the optical equipment that now uses in ships to its limitation. The method can be popularized and applied in many other fields of dark and small targets detection by TV.


Tan H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao Z.,University of Chinese Academy of Sciences | Niu M.,Beijing University of Chemical Technology | And 5 more authors.
Nanoscale | Year: 2014

Colored TiO2 has attracted enormous attention due to its visible light absorption and excellent photocatalytic activity. In this report, we develop a simple and facile solid-state chemical reduction approach for a large-scale production of colored TiO2 at mild temperature (300-350 °C). The obtained sample possesses a crystalline core/amorphous shell structure (TiO2@TiO2-x). The oxygen vacancy results in the formation of a disordered TiO2-x shell on the surface of TiO 2 nanocrystals. XPS and theoretical calculation results indicate that valence band tail and vacancy band below the conduction band minimum appear for the TiO2-x, which implies that the TiO2@TiO2-x nanocrystal has a narrow band gap and therefore leads to a broad visible light absorption. Oxygen vacancy in a proper concentration promotes the charge separation of photogenerated carriers, which improves the photocatalytic activity of TiO2@TiO2-x nanocrystals. This facile and general method could be potentially used for large scale production of colored TiO2 with remarkable enhancement in the visible light absorption and solar-driven H2 production. © 2014 the Partner Organisations.


Wang B.,Jilin University | Wang B.,Changchun Normal University | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Sensors and Actuators, B: Chemical | Year: 2014

A novel luminescent platinum(II) complex platinum 5,10,15,20-tetra{4-[(N- carbazyl)butyloxyphenyl]}porphyrin (PtTCBPyP) has been synthesized and characterized by 1H NMR, elemental analysis, IR and UV-vis. The platinum porphyrin is assembled with mesoporous silica SBA-15 and MCM-41 resulting in the assembly materials PtTCBPyP/SBA-15 and PtTCBPyP/MCM-41. The luminescence of platinum porphyrin complex/silicate assemble materials can be quenched by molecular oxygen with very high response (I0/I 100 > 8700 for PtTCBPyP/SBA-15(20 mg/g) and I0/I 100 > 3800 for PtTCBPyP/MCM-41(20 mg/g)), indicating that platinum porphyrin complex/silicate systems can be employed to develop high performance oxygen sensors. Among this assembly system, PtTCBPyP/SBA-15(20 mg/g) exhibits the highest response of platinum porphyrin complex/silica. © 2013 Elsevier B.V.


Li Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li Y.,Peking University | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Luo Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Journal of Materials Chemistry | Year: 2011

We synthesized a series of Yb3+, Er3+ and Tm 3+ tri-doped Lu2O3 nanocrystals with various dopant concentrations by the hydrothermal approach. Due to a unique electronic state at the top of the valence band, Lu2O3 based materials exhibit intense upconversion luminescence involving 1G 4 → 3H6 of Tm3+ in blue, ( 2H11/2, 4S3/2) → 4I15/2 in green and 4F9/2 → 4I15/2 in red of Er3+ upon near infrared excitation at 980 nm. The variation of upconversion spectra and color points with dopant concentrations and pump densities are studied in detail on the basis of energy transfer processes. An ideal white upconversion light with color coordinates of (0.327, 0.339) is obtained by controlling the intensity of red, green, and blue emission in Lu1.906Yb0.08Er 0.008Tm0.006O3 nanocrystals under a pump density of 8 W cm-2. Based on the present experimental data, we may predict the dopant concentrations and pump densities for any color point within or around the white light region in the tri-doped Lu2O3 nanocrystals. © The Royal Society of Chemistry 2011.


Zhao Y.,National University of Singapore | Pan F.,National University of Singapore | Li H.,National University of Singapore | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Journal of Physical Chemistry C | Year: 2013

With biocompatible oxalic acid as chelating agent, uniform titania hollow spheres were solvothermally obtained. The hollow spheres are composed of 23% brookite phase and 77% anatase phase with good crystallinity. These biphase hollow spheres, possessing large surface area and mesoporousity, form via a typical asymmetric Ostwald ripening mechanism. During this facile process, the oxalic acid plays essential roles in producing the hollow sphere structure, both maintaining the uniformity of the spherical structure and transferring titanium ions during the Ostwald ripening process. © 2013 American Chemical Society.


Chen H.,Shanghai University | Chen H.,Jinan University | Pan T.,Jinan University | Chen J.,Jinan University | And 2 more authors.
Chemometrics and Intelligent Laboratory Systems | Year: 2011

Savitzky-Golay (SG) smoothing and moving window partial least square (MWPLS) methods were applied to the model optimization and the waveband selection for near-infrared (NIR) spectroscopy analysis of soil organic matter. The optimal single wavelength prediction bias (OSWPB) was used to evaluate the similarity of calibration set and prediction set, and a new division method for calibration set and prediction set was proposed. SG smoothing modes were expanded to 540 kinds. The specific computer algorithm platforms for optimization of SG smoothing mode combined with PLS factor and for MWPLS method with changeable parameters were built up. The optimal waveband for soil organic matter was 1926-2032nm, the optimal smoothing mode was the 2nd order derivative, 6th degree polynomial, 45 smoothing points, the PLS factor, RMSEP and RP were 8, 0.260 (%) and 0.877 respectively. The prediction effect was obviously better than that in the whole spectral collecting region. To get stable results, all the optimization processes were based on the average prediction effect on 50 different divisions of calibration set and prediction set. © 2011 Elsevier B.V.


Di F.,Key Laboratory of Optical System Advanced Manufacturing Technology | Di F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advanced Materials Research | Year: 2011

This paper studies the polishing mechanism of SiC optic surface; it also introduces the grinding mechanism of ceramic material - indentation fracture model. In this paper, the model of SiC polishing in ideal condition is analyzed and the mechanism of SiC polishing in real state is studied. As aerospace technology and laser technology develop rapidly, higher demand for optic system is brought forward. Higher quality of speculums and optic components in the system are also needed. In order to ensure the stability of the structures of speculums and optic components at work or in the process of manufacturing and testing, and to take into consideration the lightweight requirement for speculums in aerospace optic systems and the stability of the optic components at work in laser system, a series of physical indices are put forward for speculum material: low density, high elasticity modulus, low coefficient of thermal expansion, no thermal stress, high thermal conductivity and mechanical isotropy. Traditional materials can no longer meet these requirements. With a number of excellent physical qualities, such as high elasticity modulus, proper density, comparatively low coefficient of thermal expansion, high thermal conductivity, high heat resistance, high specific stiffness, high stability in size, etc., SiC becomes a very promising material for speculums. [1-5] Accordingly, the study on the processing of the optic surface of SiC speculums is made widely home and abroad. However, the study on the polishing mechanism of SiC optic surface still remains untouched. The polishing of optic surface is affected by many factors, so quantitative control over it is very difficult. For many years, technicians have been exploring the relationships between material removal rate and various affecting factors. M. J. Cumbo, D. Fairhurst and S. D. Jacobs have proposed a successful polishing mechanism of optic glass. They believe polishing is a mechanic-chemical process. During a polishing process, on one hand, machines remove the material to conform to Preston Hypothesis; on the other hand, three chemical reactions occur, namely, (1) the hydration and dissolution of glass material in polishing liquid; (2) the redeposition of debris on the glass surface; (3) the electric charge exchanges between the surfaces of glass material and polishing material. Due to these chemical reactions, the Preston constant actually measured from glass material is two orders of magnitude lower than the theoretical value of the mechanical process, i.e. the inverse of the elasticity modulus of the glass material. To sum up, the chemical processes exert great influence on the polishing of glass material. SiC material is quite different from glass material and the chemical activity of its components is much lower than that of the components of the glass material. Neither α-SiC nor β-SiC hydrates or dissolves. Not to mention the redeposition of the debris. Therefore, in polishing SiC, chemical reactions almost work to no effect. We believe the polishing of SiC material can be taken as a process of mechanical removal. An ideal SiC material polishing process can be illustrated with indentation fracture model - a similar grinding mechanism of ceramic material. © (2011) Trans Tech Publications.


Ma H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu L.,University of Adelaide
Applied Optics | Year: 2015

We present the design of a horizontally staggered lightguide solar concentrator with lateral displacement tracking for high concentration applications. This solar concentrator consists of an array of telecentric primary concentrators, a horizontally staggered lightguide layer, and a vertically tapered lightguide layer. The primary concentrator is realized by two plano-aspheric lenses with lateral movement and maintains a high F-number over an angle range of ± 23.5°. The results of the simulations show that the solar concentrator achieves a high concentration ratio of 500 × with ± 0.5° of acceptance angle by a single-axis tracker and dual lateral translation stages. © 2015 Optical Society of America.


Zhang J.L.,National University of Singapore | Xu J.L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Niu T.C.,National University of Singapore | Lu Y.H.,National University of Singapore | And 2 more authors.
Journal of Physical Chemistry C | Year: 2014

Understanding the single-molecule switching mechanism in densely packed, rationally designed, and highly organized nanostructures is crucial for practical applications such as high-density data storage devices. In this article, we report an in situ low-temperature scanning tunneling microscopy (LT-STM) investigation of reversible switching of a single-dipole molecule (chloroaluminium phthalocyanine, ClAlPc) imbedded in two-dimensional (2D) hydrogen-bonded binary molecular networks on graphite. The single-molecule switching is highly localized and reversible and leaves the neighboring molecular network unaffected. The switching direction can be controlled by the polarity of the voltage pulse applied to the STM tip. On the basis of experimental results and theoretical calculations, the reversible switching is proposed to be caused by the "shuttling" of the Cl atom between two sides of the ClAlPc molecular plane. © 2014 American Chemical Society.


Zhang J.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xie F.,Luoyang Institute of Electro Optical Equipment | Xue Q.-S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xin J.-X.,Dalian Opti Photoelectric Instruments Co.
Chinese Optics | Year: 2015

In order to meet the leaser guiding requirements, such as large FOV, high linearity detecting and so on, the working principle and characteristics of four-quadrant detector are introduced based on the application requirements of laser-guided bombs. Spot size, energy uniformity, linearity, detection range and other parameters which influence detection accuracy are analyzed. Based on the system requirements, a reasonable structure type of optical system is selected, and optical system design and machine design are completed. Distortion, spot diagram, footprint and geometric encircled energy are used to evaluate the system performance, and the effects of target size and detection distance on spot size of the guidance system are presented. Test results show that the total FOV is ±20°; the linear FOV is ±10°; the detectable target size is 1.5~2.4 m; the detectable detection range is 50 m~4 km and angle detecting accuracy is better than 0.2°, which meet the needs of laser guidance. © 2015, Editorial Office of Chinese Optics. All right reserved.


Guo X.,Jilin University | Di W.,Jilin University | Chen C.,University of Maine, United States | Liu C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Dalton Transactions | Year: 2014

The previous works by our group (Chem. Commun., 2010, 46, 2304-2306; ACS Catal., 2013, 3, 405-412; Phys. Chem. Chem. Phys., 2013, 15, 14681-14688) have reported the near-infrared-driven photocatalysis of broadband semiconductor TiO2 or ZnO that was combined with upconverting luminescence particles to form a core-shell structure. However, the photocatalytic efficiency is low for this new type of photocatalysts. In this work, NaYF 4:Yb,Tm/CdS/TiO2 composites for NIR photocatalysis were prepared by linking CdS and TiO2 nanocrystals on the NaYF 4:Yb,Tm microcrystal surfaces. CdS and TiO2 were well interacted to form a heterojunction structure. The energy transfer between NaYF4:Yb,Tm and the semiconductors CdS and TiO2 was investigated by steady-state and dynamic fluorescence spectroscopy. The photocatalytic activities of the as-prepared composites were evaluated by the degradation of methylene blue in aqueous solution upon NIR irradiation. Significantly, it was found that the united adhesions of CdS and TiO2 on the NaYF4:Yb,Tm particle surfaces showed much higher catalytic activities than the individual adhesion of CdS or TiO2 on the NaYF4:Yb,Tm surfaces. This was attributed mainly to the effective separation of the photogenerated electron-hole pairs due to the charge transfer across the CdS-TiO2 interface driven by the band potential difference between them. The presented composite structure of upconverting luminescence materials coupled with narrow/wide semiconductor heterojunctions provides a new model for improved NIR photocatalysis. © The Royal Society of Chemistry 2014.


Dai Z.-G.,Hubei University of Education | Dai Z.-G.,Wuhan University | Xiao X.-H.,Hubei University of Education | Wu W.,Wuhan University | And 8 more authors.
Light: Science and Applications | Year: 2015

Graphene-plasmonic hybrid platforms have attracted an enormous amount of interest in surface-enhanced Raman scattering (SERS); however, the mechanism of employing graphene is still ambiguous, so clarification about the complex interaction among molecules, graphene, and plasmon processes is urgently needed. We report that the number of graphene layers controlled the plasmon-driven, surface-catalyzed reaction that converts para-aminothiophenol (PATP)-to-p,p9-dimercaptoazobenzene (DMAB) on chemically inert, graphene-coated, silver bowtie nanoantenna arrays. The catalytic reaction was monitored by SERS, which revealed that the catalytic reaction occurred on the chemical inertness monolayer graphene (1G)-coated silver nanostructures. The introduction of 1G enhances the plasmon-driven surface-catalyzed reaction of the conversion of PATP-to-p,p9-DMAB. The chemical reaction is suppressed by bilayer graphene. In the process of the catalytic reaction, the electron transfer from the PATP molecule to 1G-coated silver nanostructures. Subsequently, the transferred electrons on the graphene recombine with the hot-hole produced by the localized surface plasmon resonance of silver nanostructures. Then, a couple of PATP molecules lost electrons are catalyzed into the p,p9-DMAB molecule on the graphene surface. The experimental results were further supported by the finite-difference time-domain method and quantum chemical calculations. © 2015 CIOMP.


Wang Y.,Nanyang Technological University | Ni Z.,Nanyang Technological University | Ni Z.,Nanjing Southeast University | Liu L.,Nanyang Technological University | And 7 more authors.
ACS Nano | Year: 2010

The optical conductivities of graphene layers are strongly dependent on their stacking orders. Our first-principle calculations show that, while the optical conductivities of single-layer graphene (SLG) and bilayer graphene (BLG) with Bernal stacking are almost frequency-independent in the visible region, the optical conductivity of twisted bilayer graphene (TBG) is frequency-dependent, giving rise to additional absorption features due to the band folding effect. Experimentally, we obtain from contrast spectra the optical conductivity profiles of BLG with different stacking geometries. Some TBG samples show additional features in their conductivity spectra, in full agreement with our calculation results, while a few samples give universal conductivity values similar to that of SLG. We propose that those variations of optical conductivity spectra of TBG samples originate from the difference between the commensurate and incommensurate stackings. Our results reveal that the optical conductivity measurements of graphene layers indeed provide an efficient way to select graphene films with desirable electronic and optical properties, which would greatly help the future application of those large-scale misoriented graphene films in photonic devices. © 2010 American Chemical Society.


Duan H.,Northeast Normal University | Zhao W.,Northeast Normal University | Wang G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang G.,University of Chinese Academy of Sciences | Feng X.,Yili Normal University
Mathematical Problems in Engineering | Year: 2012

Due to the shortcomings in the traditional methods which dissatisfy the examination requirements in composing test sheet, a new method based on tabu search (TS) and biogeography-based optimization (BBO) is proposed. Firstly, according to the requirements of the test-sheet composition such as the total score, test time, chapter score, knowledge point score, question type score, cognitive level score, difficulty degree, and discrimination degree, a multi constrained multiobjective model of test-sheet composition is constructed. Secondly, analytic hierarchy process (AHP) is used to work out the weights of all the test objectives, and then the multiobjective model is turned into the single objective model by the linear weighted sum. Finally, an improved biogeography-based optimization-TS/BBO is proposed to solve test-sheet composition problem. To prove the performance of TS/BBO, TS/BBO is compared with BBO and other population-based optimization methods such as ACO, DE, ES, GA, PBIL, PSO, and SGA. The experiment illustrates that the proposed approach can effectively improve composition speed and success rate. © 2012 Hong Duan et al.


Yuan X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yuan X.,University of Chinese Academy of Sciences | Zheng J.,Ningbo University of Technology | Zeng R.,Guizhou Normal University | And 6 more authors.
Nanoscale | Year: 2014

The thermal stability of luminescence is important for the application of quantum dots (QDs) in light-emitting devices. The temperature-dependent photoluminescence (PL) intensities and decay times of Mn-doped ZnS, ZnSe, and ZnSeS alloyed core-shell QD films were studied in the temperature range from 80 to 500 K by steady-state and time-resolved PL spectroscopy. It was found that the thermal stability of Mn-doped QD emissions was significantly dependent on the shell thickness and the host bandgap, which was higher than that of workhorse CdSe QDs. Nearly no PL quenching took place in Mn:ZnS QDs with a thick ZnS shell, which kept a high PL quantum yield (QY) of ∼50% even at 500 K; and the thermally stable PL was also observed in highly luminescent Mn:ZnSe and Mn:ZnSeS QDs with a quenching temperature over 200 °C. Further, the stability of Mn-doped QDs with different shell thickness at high temperature was also examined through heating-cooling cycling experiments. The PL quenching in the thick shell-coated Mn-doped QDs was almost totally recovered. The PL quenching mechanisms of the Mn2+ ion emissions were discussed. © 2014 The Royal Society of Chemistry.


Cao S.,Taiyuan University of Technology | Cao S.,Ningbo University of Technology | Zheng J.,Ningbo University of Technology | Zhao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 6 more authors.
Journal of Materials Chemistry C | Year: 2013

We demonstrate a strategy for the growth of Mn2+ ion doped cadmium based II-VI semiconductor quantum dots (QDs) with a designed buffer layer of ZnS (MnS/ZnS/CdS or Mn:CdS QDs), which aims to meet the challenge of obtaining highly efficient and well-resolved Mn2+ ion emission. First, small, high quality MnS cores are obtained by using thiols to replace conventional alkyl amines as capping ligands. Then a buffer layer of ZnS with a tailored thickness is introduced to the QDs before the growth of CdS shells to reduce the size mismatch between the Mn2+ (dopant) and Cd 2+ (host) ions. The fabricated MnS/ZnS/CdS core/shell QDs exhibit a high PL QY of up to 68%, which is the highest ever reported for any type of Mn2+ ion doped cadmium based II-VI semiconductor QD. The photoluminescence (PL) of the QDs consists of well-resolved Mn2+ ion emission without any detectable emission from the CdS band edge or surface defects. In addition, our MnS/ZnS/CdS QDs cannot only be made water-soluble, but can also be coated by ligands with short carbon chain lengths, nearly without cost to the PL QY, which could make them strong candidates for practical applications in biology/biomedicine and opto/electronic devices. © The Royal Society of Chemistry 2013.


Jiang D.L.,Harbin Normal University | Li L.,Harbin Normal University | Chen H.Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen H.Y.,University of Chinese Academy of Sciences | And 4 more authors.
Applied Physics Letters | Year: 2015

A metal-semiconductor-metal (MSM) structure ultraviolet photodetector has been fabricated from amorphous InGaZnO (a-IGZO) film at room temperature. The photodetector can work without consuming external power and show a responsivity of 4 mA/W. The unbiased photoresponse characteristic is attributed to the hole-trapping process occurred in the electrode/a-IGZO interface, and a physical model based on band energy theory is proposed to explain the origin of the photoresponse at zero bias in our device. Our findings may provide a way to realize unbiased photoresponse in the simple MSM structure. © 2015 AIP Publishing LLC.


Zhan D.,Nanyang Technological University | Yan J.,Nanyang Technological University | Lai L.,Nanyang Technological University | Ni Z.,Nanjing Southeast University | And 2 more authors.
Advanced Materials | Year: 2012

Graphene exhibits many unique electronic properties owing to its linear dispersive electronic band structure around the Dirac point, making it one of the most studied materials in the last 5-6 years. However, for many applications of graphene, further tuning its electronic band structure is necessary and has been extensively studied ever since graphene was first isolated experimentally. Here we review the major progresses made in electronic structure engineering of graphene, namely by electric and magnetic fields, chemical intercalation and adsorption, stacking geometry, edge-chirality, defects, as well as strain. Tuning the electronic band structure of graphene is of great importance for its application in electronic devices. In this paper, we review the recent progress in electronic structure engineering of graphene, by applying electric and magnetic fields, introducing chemical intercalation and adsorption, changing stacking geometry and edge structure, introducing defects, as well as applying strain. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Qiao Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qiao Q.,University of Chinese Academy of Sciences | Qiao Q.,Zhejiang Ocean University | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 7 more authors.
Nanoscale | Year: 2013

Electrically pumped random lasing has been realized in Au/MgO/ZnO structures. By incorporating Ag nanoparticles, whose extinction spectrum overlaps well with the emission spectrum of the structures, the threshold of the random lasing can be decreased from 63 mA to 21 mA. The decrease in the threshold has been attributed to the resonant coupling between the carriers in the active layer of the structures and the surface plasmon of the Ag nanoparticles. This journal is © The Royal Society of Chemistry.


Zhu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhu H.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang J.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 9 more authors.
Advanced Materials | Year: 2010

Electrically pumped random lasers are realized in ZnO nanocrystallite films in a simple metal-oxide-semiconductor structure. By introducing an i-ZnO layer, a threshold current of 6.5 mA is obtained. The reported results provide a simple route to electrically pumped random lasing (see figure) with relatively low threshold, a significant step towards the future applications of this kind of laser. (Fig. Represented) © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.


An J.,Beihang University | Liu J.,Beihang University | Zhou Y.,Lanzhou University | Zhao H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Journal of Physical Chemistry C | Year: 2012

Unlike conventional routes for preparing graphene/polyaniline (G/PANI) composites coupled by van der Waals forces, an approach to graft polyaniline (PANI) nanofibers onto graphene to acquire a polyaniline-graphene (PANI-G) hybrid connected by amide groups is described in this study. The chemical bonding between graphene and PANI is confirmed by infrared spectroscopy and X-ray photoelectron spectroscopy. The Raman spectrum of PANI-G hybrid demonstrates a close interaction between graphene and PANI. Electrochemical tests show that PANI-G hybrid has a high capacitance (623.1 F/g) at a current density of 0.3 A/g, higher than that in G/PANI composites reported previously. In addition, the retained capacitance of the PANI-G hybrid in the long term charge/discharge cycling test reached as high as 510 F/g at a current density of 50 A/g, suggesting its potential use in supercapacitors. First-principle calculations were carried out to study the electronic structures of PANI-G hybrid. The results show that the carbonyl group in the amide linkage plays a key role in the formation of -conjugated structure, facilitates charge transfer, and consequently improves capacitance and cycling ability. © 2012 American Chemical Society.


Li S.,Stevens Institute of Technology | Liu B.,University of Massachusetts Amherst | Chen B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lou Y.,Yiwu Industrial and Commercial College
Neural Computing and Applications | Year: 2013

Location information is useful for mobile phones. There exists a dilemma between the relatively high price of GPS devices and the dependence of location information acquisition on GPS for most phones in current stage. To tackle this problem, in this paper, we investigate the position inference of phones without GPS according to Bluetooth connectivity and positions of beacon phones. With the position of GPS-equipped phones as beacons and with the Bluetooth connections between neighbor phones as constraints, we formulate the problem as an optimization problem defined on the Bluetooth network. The solution to this optimization problem is not unique. Heuristic information is employed to improve the performance of the result in the feasible set. Recurrent neural networks are developed to solve the problem distributively in real time. The convergence of the neural network and the solution feasibility to the defined problem are both theoretically proven. The hardware implementation of the proposed neural network is also explored in this paper. Simulations and comparisons with different application backgrounds are considered. The results demonstrate the effectiveness of the proposed method. © 2012 Springer-Verlag London Limited.


Cao Q.,Jilin University | Zuo C.,Jilin University | Li L.,Jilin University | Zhang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yan G.,Jilin University
Journal of Polymer Science, Part B: Polymer Physics | Year: 2012

Molecular dynamics simulations were performed for electro-osmotic flow (EOF) confined in a polyelectrolyte-grafted nanochannel under variable grafting density and normal electric field. With decreasing the value of the normal electric field, the brush undergoes a collapse transition, and the ion distribution is changed significantly. The brush thickness increases on increasing the grafting density at positive and weak negative electric fields, whereas a reduced brush thickness is observed at strong negative electric field. Our results further reveal that the flow velocity is not only dependent on conformational transition of the brush but also related to the cation and anion distributions. At low grafting density, the EOF is almost completely quenched at high electric field strength due to strong surface friction between ions and walls. For the case of very dense grafting, the flow velocity is influenced weakly within the brush when varying the grafting density. Additionally, a bidirectional flow occurs at an intermediate electric field. The investigation on fluid flux indicates that the fluid flux is insensitive to the grafting density, when the normal electric field is removed. For nonzero normal electric fields, a significant change in the fluid flux is observed at low grafting densities. © 2012 Wiley Periodicals, Inc.


Hou L.,Jilin University | Cui S.,Jilin University | Fu Z.,Jilin University | Wu Z.,CAS Changchun Institute of Applied Chemistry | And 2 more authors.
Dalton Transactions | Year: 2014

Trivalent rare-earth (RE3+ = Eu3+, Tb3+) ion activated KLa(MoO4)2 microspheres have been synthesized at 180°C via a facile hydrothermal route without using any templates, surfactant, or other organic additives. X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), photoluminescence (PL), and photoluminescent excitation spectra (PLE) were employed to characterize the samples. It is found that the pH value in the initial solution is responsible for crystal phase, shape determination and emission intensity of final products. The possible formation mechanism for products with uniform spheres has been presented. Furthermore, a systematic study on the photoluminescence of RE 3+ (RE3+ = Eu3+, Tb3+) doped KLa(MoO4)2 samples has been explored in order to obtain the multicolor tunable emission by varying the Tb3+/Eu3+ ratio. The tunable luminescence may be potentially applied in fields such as solid state lighting and field emission displays. This journal is © the Partner Organisations 2014.


Fu Z.,Jilin University | Wang X.,Jilin University | Yang Y.,Hebei University | Wu Z.,CAS Changchun Institute of Applied Chemistry | And 2 more authors.
Dalton Transactions | Year: 2014

Uniform and well-crystallized calcium fluorapatite [Ca5(PO 4)3F, FAP] microrods have been successfully synthesized by a facile one-step hydrothermal synthesis method using sodium citrate as the crystal modifier. X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), photoluminescent excitation spectra (PLE) and decay studies were employed to characterize the samples. The electronic structure and orbital population of FAP were also determined by means of density functional theory calculations. Under ultraviolet irradiation, the FAP:Tb3+,Eu3+ samples exhibit a blue-light emission of the host matrix, as well as the typical green emission band of the Tb3+ ions, and a red-light emission of Eu 3+. The highly intense red emission bands of the Eu3+ ions were attributed to the effective energy transfer from the Tb3+ to Eu3+ ions, which has been justified through the luminescence spectra and the fluorescence decay dynamics. The luminescence colors of FAP:Tb 3+,Eu3+ microrods can be easily tuned by changing the concentration of Eu3+ ions. The results reveal that the combination of the self-activated luminescence and rare earth-doping emission in FAP:Tb 3+,Eu3+ microrods could result in tunable emission in a large color gamut, which can be used as a potential candidate for white-light-emitting diodes and other display devices. © 2014 The Royal Society of Chemistry.


Cao C.,Jinggangshan University | Qin W.,Jilin University | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Nanoscience and Nanotechnology | Year: 2010

20%Yb 3+, 0.5%Tm 3+ co-doped YF 3 and GdF 3 were synthesized through a facile hydrothermal method. After annealing under an argon atmosphere, the sizes and morphologies of the two samples were characterized by field emission scanning electron microscopy, and the phase and crystallization were analyzed by X-ray diffraction. With a 980 nm continuous wave laser diode as the excitation source, blue and ultraviolet upconversion emissions in the wavelength range of 260-510 nm of Tm 3+ and Gd 3+/Tm 3+ ions were recorded. Under the same excitation conditions, the upconversion emission spectra of the two nanocrystals were compared and analyzed. Gd 3+ in the ground state cannot absorb 980 nm photons directly because of the large energy gap between the ground state 8S 7/2 and the first excited state 6P 7/2. In the 20%Yb 3+, 0.5%Tm 3+ co-doped GdF3 nanocrystals, the excited states 6l j of Gd 3+ can be populated through the energy transfer 3P 2 → 3H 6 (Tm 3+): 8S 7/2 → 6l j(Gd 3+), meaning that Yb 3+ acted as primary sensitizers and Tm 3+ acted as secondary sensitizers, transferred energies to host material Gd 3+ and resulted in the ultraviolet upconversion emission of the host ions. In this article, the upconversion luminescent dynamics were studied at the onset of a 980 nm pulsed laser from an optical parametric oscillator pumped by a 10 ns pulsed Nd:YAG laser, too Copyright © 2010 American Scientific Publishers All rights reserved.


Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Kong X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Tu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 5 more authors.
Chemical Communications | Year: 2011

The concentration quenching threshold of upconversion luminescence was broken through for the first time via a designed strategy: spatial separation of the emitter doping area. © 2011 The Royal Society of Chemistry.


Zhang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu Y.,Jilin University | Zhang B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2015

Silicon carbide (SiC) is a wide bandgap semiconductor which exhibits outstanding mechanical, chemical properties, and potential for a wide range of applications. Laser technology is being established as an indispensable powerful tool to induce structural or morphological modifications on hard brittle materials. SiC (6H-SiC wafer) is irradiated by nanosecond pulsed Nd:YAG laser to evaluate microstructure and mechanical properties of irradiation areas. Raman spectroscopy analysis reveals that irradiations produce homonuclear Si-Si bonds and disordered phase of crystalline SiC. Crystal structure changes are observed as a consequence of laser-induced melting and resolidification. Hardness in the irradiation area exhibits a significant decrease. The formation of silicon film facilitates material removal rate, surface electrical conductivity, and ceramics conjunction. © 2015 Chinese Optics Letters.


Ding M.,University of Jinan | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yao B.,Jilin University | Li Z.,Western Digital Company | Xu X.,University of Jinan
RSC Advances | Year: 2015

High quality ZnO microwires have been fabricated by chemical vapor deposition method. Ultraviolet photodetector based on heterojunction of n-ZnO (individual microwire)/p-GaN film was fabricated. The current-voltage characteristic of the photodetector was investigated, which showed that the heterojunction had rectifying behavior with rectification ratio (Iforward/Ireverse) of about 6.3 × 102 at 4 V. The photoresponse spectrum displayed a sharp cut-off at the wavelength of 380 nm, and the photoresponsivity was as high as 0.45 A W-1 at 0 V and 1.3 A W-1 at 2.5 V reverse bias. The ultraviolet-visible rejection ratio (R370 nm/R450 nm) is three orders of magnitude under zero bias. This journal is © 2015 The Royal Society of Chemistry.


Di W.,Jilin University | Di W.,Japan National Institute of Materials Science | Ren X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Biomaterials | Year: 2011

Multifunctional materials for biological use have mostly been designed with composite or hybrid nanostructures in which two or more components are incorporated. The present work reports on a multifunctional biomaterial based on single-phased luminescent mesoporous lanthanide oxide nanoparticles that combine simultaneous drug delivery and cell imaging. A simple strategy based on solid-state-chemistry thermal decomposition process was employed to fabricate the spherical mesoporous Gd 2O 3:Eu nanoparticles with homogeneous size distribution. The porous nanoparticles developed by this strategy possess well-defined mesopores, large pore size and volume, and high specific surface area. The mesoporous features of nanoparticles impart the material with capabilities of loading and releasing the drug with a relatively high loading efficiency and a sustained release behavior of drugs. The DOX-loaded porous Gd 2O 3 nanoparticles are able to kill the cancer cells efficiently upon incubation with the human cervical carcinoma (HeLa) cells, indicating the potential for treatment of cancer cells. Meanwhile, the intrinsic luminescence of Gd 2O 3:Eu nanoparticles gives the function of optical imaging. Therefore, the drug release activity and effect of drugs on the cells can be effectively monitored via luminescence of nanoparticles themselves, realizing multifunctionality of simultaneous cell imaging and anticancer drug delivery in a single-phased nanoparticle. © 2011 Elsevier Ltd.


Tian Z.-N.,Jilin University | Wang L.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen Q.-D.,Jilin University | Jiang T.,Jilin University | And 2 more authors.
Optics Letters | Year: 2013

We report an innovative approach for beam shaping of edge-emitting semiconductor diode lasers using a single double-axial hyperboloidal micro-lens fabricated with femtosecond laser direct writing technology. The two hyperboloids of different axial lengths focus the light from fast and slow axes to an identical focal spot. The divergence angles were shaped from 60° and 9° to 6.9 and 32.3 mrad, respectively, and the single-end fiber coupling efficiency is measured higher than 80%. The device is simple in fabrication, robust in structure, and easy for operation, by which multiple reflections and absorptions at interfaces are reduced, and assembly errors are minimized. © 2013 Optical Society of America.


Huang H.,Jilin University | Yang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ma S.,Jilin University
Journal of Electronic Imaging | Year: 2013

Image restoration and deconvolution from blurry and noisy observation is known to be ill-posed. To stabilize the recovery, total variation (TV) regularization is often utilized for its beneficial edge in preserving the image's property. We take a different approach of TV regularization for image restoration. We first recover horizontal and vertical differences of images individually through some successful deconvolution algorithms. We restore horizontal and vertical difference images separately so that each is more sparse or compressible than the corresponding original image with a TV measure. Then we develop a novel deconvolution method that recovers the horizontal and vertical gradients, respectively, and then estimate the original image from these gradients. Various experiments that compare the effectiveness of the proposed method against the traditional TV methods are presented. Experimental results are provided to show the improved performance of our method for deconvolution problems. © 2013 SPIE and IS and T.


Li F.,Jilin University | Li C.,Jilin University | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Bai T.,Jilin University | And 4 more authors.
Dalton Transactions | Year: 2013

Monodisperse water-soluble LaF3:Ln3+ nanocrystals (NCs) have been successfully fabricated via a fast, facile and environmentally-friendly microwave-assisted modified polyol process with polyvinylpyrrolidone (PVP) as an amphiphilic surfactant. The obtained NCs can be well dispersed in hydrophilic solutions with small sizes in the range of 9-12 nm. The LaF3:Ln3+ NCs (Ln = Eu, Nd, Ce, Tb, Yb, Er, Yb, Ho and Yb, Tm) have the unique feature of up-down conversion from visible to NIR emission owing to the ladder-like arranged energy levels of Ln3+ and in particular, the high efficiency upconversion of the two-photon, obtained from excitation by a continuous 980 nm laser. This investigation focuses on both the up and down conversion fluorescence properties of water-soluble monodisperse crystalline LaF3:Ln3+ NCs in such a small size. Furthermore, the three-dimensional PDMS rod-like fluorescence displays and a silica surface modification by a core/shell structure on the obtained NCs can improve the biocompatibility, indicating potential applications in optical 3D devices and as bio-probes. This journal is © The Royal Society of Chemistry 2013.


Zhang C.,Jilin University | Guo S.,Jilin University | Cao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guan J.,Jilin University | Gao F.,Jilin University
Optics Express | Year: 2014

We propose a novel method for object reconstruction of ghost imaging based on Pseudo-Inverse, where the original objects are reconstructed by computing the pseudo-inverse of the matrix constituted by the row vectors of each speckle field. We conduct reconstructions for binary images and gray-scale images. With equal number of measurements, our method presents a satisfying performance on enhancing Peak Signal to Noise Ratio (PSNR) and reducing computing time. Being compared with the other existing methods, its PSNR distinctly exceeds that of the traditional Ghost Imaging (GI) and Differential Ghost Imaging (DGI). In comparison with the Compressive-sensing Ghost Imaging (CGI), the computing time is substantially shortened, and in regard to PSNR our method exceeds CGI on grayscale images and performs as well as CGI visually on binary images. The influence of both the detection noise and the accuracy of measurement matrix on PSNR are also presented. © 2014 Optical Society of America.


Yao K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yao K.,University of China Academy of science | Wang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu W.,Jilin University
Optics Express | Year: 2014

We describe a closed-loop dynamic holographic adaptive optics system. This system can be realized via one liquid crystal spatial light modulator and one CCD camera. The liquid crystal spatial light modulator is used as the wavefront sensor and corrector, as well as imaging element. CCD detects the spots at holographic image plane and at focal plane of imaging channel simultaneously. The basic principle of the system is introduced first, and then the numerical analysis is presented. On this basis, we report a practical implementation of the dynamic holographic adaptive optics system. The results show that a rapid increase of Strehl ratio and improved image quality at focal plane for deliberately introduced aberrations can be achieved, verifying the feasibility of the system. © 2014 Optical Society of America.


Cao Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao Y.,Jilin University | Xie J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu Y.,Northeastern University | Liu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optics Express | Year: 2014

In this paper, we propose a method for designing Photonic Crystal (PhC) devices that consist of dielectric rods with varying size. In the proposed design method, PhC devices are modeled with the Transformation Optics (TO) approach, and then they are optimized using the gradient method. By applying the TO technique, the original device model is transformed into an equivalent model that consists of uniform and fixed-sized rods, with parameterized permittivity and permeability distributions. Therefore, mesh refinement around small rods can be avoided, and PhC devices can be simulated more efficiently. In addition, gradient of the optimization object function is calculated with the Adjoint-Variable Method (AVM), which is very efficient for optimizing devices subject to multiple design variables. The proposed method opens up a new avenue to design and optimize a variety of photonic devices for optical computing and information processing. © 2014 Optical Society of America.


Zhu Y.,Jilin University | Sun Z.,Jilin University | Yin Z.,Jilin University | Song H.,Jilin University | And 4 more authors.
Dalton Transactions | Year: 2013

The modification of photonic crystals (PCs) on photoluminescence of rare earth (RE) ions has attracted considerable interest, however, the modification of PCs on energy transfer (ET) processes of two separate RE centers has not been investigated yet. In this paper, three-dimensional Ce3+, Tb 3+-codoped LaPO4 inverse opal PCs (IOPCs) were fabricated by the PMMA colloidal template method. The modification of the photonic stop band (PSB) on emission spectra and the dynamics of the 5d-4f transition of Ce3+ and the 4f-4f transition of Tb3+ ions were systematically studied. It is interesting to observe that the spontaneous decay rates (SDR) of 5D4-7F5 in the IOPCs were suppressed as highly as 173% in contrast to the reference ground powder samples (REF) due to the modification of the effective refractive index (n eff). The energy transfer (ET) rate of Ce3+ to Tb 3+ did not change in the IOPCs, however, the energy migration rate among Tb3+ ions was largely restrained. It is also significant to observe that, in the IOPCs, the temperature quenching and radiation trapping of photoluminescence were greatly suppressed due to the periodic empty cavity structure of IOPCs, which is significant for high-power light sources and laser devices. © 2013 The Royal Society of Chemistry.


Wang Y.,Jilin University | Wang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao X.,Jilin University
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2014

The purpose of objectively assessing digital image quality is to obtain the assessment results consistent with human visual perception. Different sensitivity factors of human visual system needs to be considered in the analysis and comparison of image structure in order to obtain the image quality assessment results consistent with human perception. Aiming at the problem that single property of image structure information is too unilateral to describe the comprehensive image structure, a complex number method is used to describe the image structure information. A complex matrix is constructed to describe the image structure information. The complex number is taken as an information combination method; and the local variance component with high human eye sensitivity in the image and the grey scale distribution of the image pixels representing general sensing information are taken as the real part and imagery part, respectively. On this basis, the structure similarity method in non-real number domain and its mathematic model were deeply studied; and the method was used to measure the structure similarity of the complex matrixes of two images; then, the quantitative results were obtained. The LIVE database including 779 distorted images and corresponding fitting function were adopted to verify the complex matrix structure similarity method. The cross-distortion experiment and classification distortion experiment results show that using the proposed complex matrix structure similarity method, the consistency of overall performance with human visual perception is better than that using the state-of-the-art methods, such as MSE, SSIM methods and the new QSSIM method.


Zhang M.,Jilin University | Cao X.,Jilin University | Li H.,Jilin University | Guan F.,Jilin University | And 5 more authors.
Food Chemistry | Year: 2012

A simple, rapid and sensitive fluorescent assay for determination of melamine has been developed based on inner filter effect (IFE) of gold nanoparticles (AuNPs) on the fluorescence of CdTe quantum dots (QDs). When thioglycolic acid-capped CdTe QDs was mixed with citrate-stabilized AuNPs, the fluorescence of CdTe QDs was significantly quenched via the IFE of AuNPs. With the presence of melamine, melamine could induce the aggregation and corresponding absorbance change of AuNPs, which then resulted in the recovery of IFE-decreased emission of CdTe QDs. Under the optimum conditions, the detection limit for melamine in raw milk was 0.02 mg L-1. The application of this method in samples of melamine-spiked raw milk suggested a recovery between 103% and 104%. Therefore, the obvious merits provided by the present assay, such as simplicity, rapidity, low cost, and high sensitivity, would make it promising for on-site screening of melamine adulterant in raw milk. © 2012 Elsevier Ltd. All rights reserved.


Zhang X.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Y.-H.,Jilin University | Ren L.-Q.,Jilin University
Applied Mechanics and Materials | Year: 2014

The soft surface of birds and aquatic organisms in the nature can effectively reduce the drag. Inspired by the fact in this paper, an attempt is made to stick silicone rubber soft surface on the surfaces of NACA 4412 and NACA 6409 airfoils. The drags, lifts and lift-drag ratios of airfoils with soft and rigid surfaces in 5 different thickness were compared through wind tunnel test under the condition of α = 0 °. The results show that most of the bionic soft surfaces play the role of reducing the aerodynamic drag, and also increasing the lift at the same time, in which the soft surface of 0.6mm had the most significant effect of drag reduction and lift increasing. © (2014) Trans Tech Publications, Switzerland.


Cao C.,Jinggangshan University | Qin W.,Jilin University | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optics Communications | Year: 2010

The Yb3+/Tm3+ co-doped GdF3 and NaGdF4 samples were synthesized through a combination method of a co-precipitation and an argon atmosphere annealing procedures. X-ray diffraction analysis indicated that the Yb3+/Tm3+ co-doped GdF3 sample crystallized well and was orthorhombic phase, and the Yb3+/Tm3+ co-doped NaGdF4 sample was hexagonal phase. With a 980-nm semiconductor continuous wave laser diode as the excitation source, the up-conversion emission spectra of the two samples in the wavelength range of 240-510 nm were recorded. In the up-conversion emissions of the samples, Yb3+ transferred energies to Tm3+ resulting in their ultraviolet, violet, and blue up-conversion emissions. And, Tm3+ simultaneously transferred energies to Gd3+, which finally resulted in ultraviolet up-conversion emissions of Gd3+. The study on the excitation power dependence of up-conversion fluorescence intensity indicated that there were multi-photon (three-, four-, five-, and six-) processes in the up-conversion emissions of the samples. And the up-conversion emissions of Gd3+ and Tm3+ in the Yb3+/Tm3+ co-doped GdF3 and NaGdF4 samples were compared studied, too. © 2009 Elsevier B.V. All rights reserved.


Wang Z.,Jilin University | Xiao Y.,Jilin University | Cui X.,Jilin University | Cheng P.,Jilin University | And 6 more authors.
ACS Applied Materials and Interfaces | Year: 2014

Urchinlike CuO modified by reduced graphene oxide (rGO) was synthesized by a one-pot microwave-assisted hydrothermal method. The as-prepared composites were characterized using various characterization methods. A humidity sensor based on the CuO/rGO composites was fabricated and tested. The results revealed that the sensor based on the composites showed much higher impedance than pure CuO. Compared with the sensors based on pristine rGO and CuO, the sensor fabricated with the composites exhibited relatively good humidity-sensing performance in terms of response time and response value. The humidity-sensing mechanism was also briefly introduced. The enlargement of the impedance and improvement of the humidity-sensing properties are briefly explained by the Schottky junction theory. © 2014 American Chemical Society.


Zhang C.-Y.,Jilin University | Qin L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang H.-J.,Jilin University
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2014

Red phosphorescent microcavity organic light-emitting device (MOLED) with structure of Glass/DBR /ITO /MoO3(1 nm)/TcTa(55 nm)/CBP: Ir(piq)2acac(44 nm, 6%)/TPBI(55 nm)/LiF(1 nm)/Al(80 nm) was fabricated. For comparison, an OLED without cavity also was fabricated. The effect of microcavity structure on luminescent properties of phosphorescent devices was studied. The electroluminescence (EL) spectrum peak of OLED is at 626 nm, and the full width at half maximum (FWHM) is 92 nm. The electroluminescence (EL) spectrum peak of MOLED is at 628 nm, and the FWHM is 42 nm which is narrowed half compared with the 92 nm value. The micro cavity structure can narrow the luminescence spectrum of OLED and improve the colour purity. For MOLED, the maximum brightness, the maximum current efficiency, the maximum external quantum efficiency (EQE) are 121 000 cd/m2, 27.8 cd/A and 28.4%, respectively. For OLED, its maximum brightness, current efficiency and external quantum efficiency are 54 500 cd/m2, 13.1 cd/A and 16.6%, respectively. Comparing with the no cavity device, the luminescence properties of microcavity device have been improved greatly. ©, 2014, Faguang Xuebao/Chinese Journal of Luminescence. All right reserved.


Sun P.,Jilin University | Zhou X.,Jilin University | Wang C.,Jilin University | Wang B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Sensors and Actuators, B: Chemical | Year: 2014

The hierarchical undoped and Cd-doped SnO2 nanostructures had been synthesized via a low-cost and environmentally friendly hydrothermal route. The morphology and structure of the as-prepared product were characterized by X-ray diffraction (XRD), field-emission electron microscopy (FESEM), and transmission electron microscopy (TEM). The images of field-emission electron microscopy and transmission electron microscopy showed that pure and Cd-doped SnO2 hierarchical architectures were built from one-dimensional nanorods. X-ray diffraction (XRD) of the doped samples revealed that Cd incorporation led to lattice deformation without destroying the original crystal structure. Gas sensors based on undoped and Cd-doped SnO2 nanorods were fabricated, and their gas sensing properties were tested for various gases. The 3.0 wt% Cd-doped SnO2 based sensor showed excellent selectivity toward H2S at the operating temperature 275 C, giving a response of about 31-10 ppm, which was about 22 times higher than that of sensor based on pure SnO2. © 2013 Elsevier B.V.


Li H.,Jilin University | Tan L.-L.,Jilin University | Jia P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li Q.-L.,Jilin University | And 5 more authors.
Chemical Science | Year: 2014

We constructed a novel cancer theranostic hybrid platform, based on mesoporous silica-coated gold nanorods (AuNR@MSN) gated by sulfonatocalix[4] arene (SC[4]A) switches, for bio-friendly near-infrared (NIR) light-triggered cargo release in a remote and stepwise fashion. The advantages of supramolecular switches, mesoporous silicas, and AuNRs were combined in one drug delivery system. Mesoporous silicas coated on AuNRs guarantee a high drug payload and can be easily post-functionalized. Significantly, the plasmonic heating from the NIR light-stimulated AuNR cores can decrease the ring-stalk binding affinity, leading to the dissociation of SC[4]A rings from the stalks, thus opening the nanovalves and releasing the cargos. The NIR light-responsive mechanized AuNR@MSN offers exciting prospects for non-invasive controlled drug delivery, being more effective and safer than other techniques. © 2014 the Partner Organisations.


Zhao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao Z.,University of Chinese Academy of Sciences | Tan H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Chemical Communications | Year: 2014

Stable reduced TiO2 rutile nanorods with well-defined facets were prepared by a solvothermal route in the presence of Zn powder. The oxygen vacancy in the TiO2 nanorods, which can be tuned by the amount of Zn, results in a narrow band gap and visible-light photocatalytic activity. © 2014 The Royal Society of Chemistry.


Qu S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang X.,Jilin University | Lu Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Angewandte Chemie - International Edition | Year: 2012

C-dots on hand: Luminescent carbon nanodots were synthesized and were shown to be biocompatible, have low toxicity, and distinctive photoluminescence properties. These C-dots are inexpensive to synthesize and could potentially be used for versatile applications, such as anticounterfeiting, information encryption, and information storage. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Gu Y.,Jilin University | Li H.,Jilin University | Xu S.,Jilin University | Liu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu W.,Jilin University
Physical Chemistry Chemical Physics | Year: 2013

The purpose of this work is to develop a high-performance surface-enhanced Raman scattering (SERS) substrate with high light harvesting and SERS emitting efficiencies based on the principle of a plasmonic nano-antenna. A prism/Ag nanowell array was designed and constructed based on the Kretschmann configuration. Almost 100% of the incident light can be absorbed at the resonance angle. A strong electromagnetic (EM) field is generated in the near field along the rim and at the center of the nanowells by means of the localized energy of surface plasmons (SPs), resulting in the electric field being enhanced 300 times at the Ag surface. The co-enhancement of localized SPs and propagating SPs was achieved in this substrate. The plasmonic nano-antenna structure can also redirect the SERS, which benefits the SERS collection. The SERS sensitivity on this configuration was improved by about 40 times compared with that on a conventional Kretschmann configuration with a flat Ag film. This SERS substrate design with full consideration on the tuning of the EM field in the near field and SERS space distribution in the far field could give insight into the design of a new generation of SERS substrates. This journal is © 2013 the Owner Societies.


Wang X.-H.,Jilin University | Wang X.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Huang W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ouyang J.-H.,Jilin University
Chinese Optics | Year: 2015

According to the detector arrays mosaic imaging system designed with four lenses based on concentric spherical lens, its applied algorithms about the image registration is investigated, such as feature detection and extraction, feature vector matching and screening, spatial transformation model and parameter estimation, etc. First, the fast-hessian detection algorithm is used to find features, and generate feature vector of SURF descriptors. Second, the fast approximate nearest neighbor search algorithm is used to obtain the initial matching points and to sort the Euclidean distance between feature vectors in the matching points. Then after screening the feature points, the good ones are preserved based on a reasonable threshold interval from the optical design parameters. Finally, the transform parameters are estimated by using the improved progressive sample consensus method and the spatial geometry transformation relationship is obtained about the reference image and registration image. Experimental results indicate that the algorithm has some invariance about the size, rotation and illumination changes; the feature matching time is 0.542 s, and the registration transform time is 0.031 s; the registration error precision is less than 0.1 pixel, which can meet the requirements of the imaging system about the image registration including good real-time and accuracy performance. © 2015, Editorial Office of Chinese Optics. All right reserved.


Zhang J.,Jilin University | Wang G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang G.,University of Chinese Academy of Sciences
Applied Mechanics and Materials | Year: 2012

Due to shortcoming of traditional image matching for computing the fitness for every pixel in the searching space, a new bat algorithm with mutation (BAM) is proposed to solve image matching problem, and a modification is applied to mutate between bats during the process of the new solutions updating. This new approach can accelerate the global convergence speed while preserving the strong robustness of the basic BA. The realization procedure for this improved meta-heuristic approach BAM is also presented. To prove the performance of this proposed meta-heuristic method, BAM is compared with BA and other population-based optimization methods, DE and SGA. The experiment shows that the proposed approach is more effective and feasible in image matching than the other model. © (2012) Trans Tech Publications, Switzerland.


Qu S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li M.,Jilin University
Chemistry - A European Journal | Year: 2011

We report an unprecedented hierarchical self-assembly of an achiral twin-tapered bi-1,3,4-oxadiazole derivative (2,2-bis(3,4,5-trioctanoxyphenyl)- bi-1,3,4-oxadiazole, BOXD-T8). This molecule can form a layer-structured lyotropic liquid crystal and further forms a helical fibrous organogel in DMF at concentrations above 0.6wt%. The self-assembly process of BOXD-T8 in DMF is accompanied by a change in its fluorescence. The pitches of the helical fibers are non-uniform, and both left- and right-handed helical fibers are observed in equal quantities. Intermolecular π-π interactions between aromatic segments have been demonstrated to be the driving force for aggregate formation. This helical structure of BOXD-T8 is dependent on the solvent, concentration, and the layer-structured intermediate liquid-crystalline state. Supramolecular chirality: An unprecedented hierarchical self-assembly of an achiral fluorescent twin-tapered bi-1,3,4-oxadiazole derivative (BOXD-T8) from lyotropic liquid crystal to helical fibrous organogel has been observed in DMF at concentrations above 0.6wt% (see figure). The helical structure of BOXD-T8 is dependent on the solvent, the concentration, and the intermediate layer-structured lyotropic liquid-crystalline state. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Yang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Z.,Jilin University | Zhu M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Huang H.,Jilin University
Optics and Laser Technology | Year: 2013

In this paper, we propose a new approach for performing efficient edge-preserving image deconvolution algorithm based on a nonlocal domain transform (NLDT). We present the geodesic distance-preserving transforming procedure of a 1D signal embedded in 2D space into a new 1D domain via a transformation for simplicity. The nonlocal domain transform derives from the (1D) nonlocal means filter kernel and iteratively and separably applies 1D edge-aware operations. In order to solve the main issue with noisy images that is finding robust estimates for their derivatives, we develop an efficient joint nonlocal domain transform filter in the deblurring process. Furthermore, we derive the discrepancy principle to automatically adjust the regularization parameter at each iteration. We compare our deconvolution algorithm with many competitive deconvolution techniques in terms of ISNR and visual quality. © 2013 Elsevier Ltd.


Xu X.,Jilin University | Li X.,Jilin University | Wang W.,Jilin University | Wang B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
RSC Advances | Year: 2014

In this work, a simple route for the synthesis of irregular In 2O3 nanoplates in the presence of oleic acid and urea is described. The structure and morphology of the as-obtained product were characterized using X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results indicate that the synthesized In2O3 nanostructures are composed of irregular nanoplates. The gas sensing properties of the as-obtained product were investigated. The sensor based on the In 2O3 irregular nanoplates exhibits a remarkably enhanced response and a fast response/recovery time towards NO2. © 2014 The Royal Society of Chemistry.


Gong X.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li M.-Z.,Jilin University | Lu Q.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Peng Z.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Materials Processing Technology | Year: 2012

In order to realize high efficient and flexible manufacturing for 3-D surface, continuous multi-point forming (CMPF) is researched. Firstly, principle of CMPF is described, and its characteristics are analyzed by comparing with the conventional spinning methods. Secondly, FEA model of CMPF for disc-shape surface is established, forming load is analyzed theoretically, equivalent stress and plastic strain distributions of disc-shape surface are analyzed. Thirdly, wrinkling is analyzed through simulation results. Fourthly, forming process of tube-shape surface is studied. Finally, CMPF equipment is developed, and experiments are carried out. Results indicate: For disc-shape surface, equivalent stress in regions of center fixture and flexible roller exceeds yield stress; the maximum plastic strain is generated in center region; plastic strain in region of flexible roller takes the second place; shell elements in wrinkling region generate tangent direction compress deformation. For tube-shape surface, maximum value of equivalent stress appears in region of flexible roller; plastic strain field presents annular distribution, its maximum value appears in marginal region. Measure results of curvature radius of disc-shape surface and tube-shape surface almost accord with simulation results. Simulation results of stress field, strain field and wrinkling almost accord with practical situation. © 2011 Elsevier B.V. All rights reserved.


Li D.,Xi'an University of Architecture and Technology | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xie G.,Jilin University
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2013

CdTe@SiO2 fluorescent nanospheres were synthesized by heating reflux method. Infrared spectra support the structural formation mechanism of the CdTe@SiO2 composite nanospheres. The CdTe@SiO2 composite nanospheres were characterized by means of SEM, TEM, IR, nitrogen adsorption isotherm, fluorescence spectra and electroluminescence spectra, etc. It was found that both pH value and reflux time played important roles in growth and quantum yield of CdTe@SiO2 fluorescent nanospheres. CdTe@SiO2 fluorescent nanospheres were fabricated to be a single electrode light-emitting diode prototype. The electroluminescence spectra and Commission International de L'Eclairage remained almost the same over a range of operation voltages, and it meant the light-emitting diodes had better color stability. So CdTe@SiO2 fluorescent nanospheres could provide a potential application in light-emitting diode. © 2013 Elsevier B.V.


Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu J.,University of Chinese Academy of Sciences | Wang D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 9 more authors.
Physical Review Letters | Year: 2012

Although nitrogen-doped zinc oxide has been fabricated as a light-emitting diode, the origin of its p-type conductivity remains mysterious. Here, by analyzing the surface reaction pathway of N in ZnO with first-principles density functional theory calculations, we demonstrate that the origin of p-type conductivity of N-doped ZnO can originate from the defect complexes of N Zn-V O and N O-V Zn. Favored by the Zn-polar growth, the shallow acceptor of N O-V Zn actually evolves from the double-donor state of N Zn-V O. While N Zn-V O is metastable, the p-doping mechanism of N Zn-V O→N O-V Zn in ZnO will be free from the spontaneous compensation from the intrinsic donors. The results may offer clearer strategies for doping ZnO p-type more efficiently with N. © 2012 American Physical Society.


Song K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Kong X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Kong X.,CAS Suzhou Institute of Biomedical Engineering and Technology | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 6 more authors.
Chemical Communications | Year: 2012

LRET-based optical biosensor of an aptamer-upconversion conjugate was constructed. It is demonstrated that photosensitized breakage and damage of aptamers are eliminated by employing UCNPs as donors, and the as-designed biosensor is specific and sensitive in the detection of ATP. © The Royal Society of Chemistry 2012.


Pan H.L.,Jilin University | Yao B.,Jilin University | Yao B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yang T.,Jilin University | And 4 more authors.
Applied Physics Letters | Year: 2010

Single wurtzite p-type Zn1-yCuy O1-x Sx alloy films with 0.081x0.186 and 0.09y0.159 were grown on quartz reproducibly by magnetron sputtering. The alloys show very stable p-type conductivity with a hole concentration of 4.31-5.78× 1019 cm-3, a resistivity of 0.29-0.34 cm and a mobility of 0.32-0.49 cm2 V-1 s-1. The p-type conductivity is attributed to substitution of Cu+1 for the Zn site, and the ionization energy of the Cu+1 acceptor is measured to be 53 meV, much less than that of Cu-doped ZnO reported previously. The small ionization energy is due to Cu heavy doping and increase in valence band maximum of ZnO induced by alloying with S. © 2010 American Institute of Physics.


Liu S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu S.,University of Chinese Academy of Sciences | Liu S.,Jilin University | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Applied Physics Letters | Year: 2010

Highly efficient nondoped phosphorescent organic light-emitting devices (NPOLEDs) with triplet multiple quantum well structures are fabricated by using 4, 4′ -N, N′ -dicarbazole-biphenyl and an iridium(III) complex as the potential barrier layer and the potential well layer/light-emitting layer, respectively. Remarkably, such NPOLED with an optimized device configuration achieves reduced current efficiency roll-off, which slightly decreases from its peak value of 31.5 cd/A at 19.8 mA/ cm2 to 29.2 cd/A at 100 mA/ cm2. We attribute this improvement to the efficient triplet exciton confinement effect and the suppression of triplet-triplet annihilation which occurs via single-step long range (Förster-type) energy transfer between excited molecules. © 2010 American Institute of Physics.


Li Y.,Nanyang Technological University | Li Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Deng R.,Nanyang Technological University | Deng R.,Jilin University | And 5 more authors.
Applied Physics Letters | Year: 2010

We investigate the room temperature ferromagnetism in band gap tunable Mgx Zn1-x O (x≤0.22) alloy thin films and find that ferromagnetism is significantly enhanced in p-type MgxZn 1-x O (x≤0.17) compared with the n-type counterparts (x≤0.15). Temperature-dependent photoluminescence measurements reveal the correlation between the p-type behavior, enhanced ferromagnetism, and zinc vacancies. First-principle calculations demonstrate that the formation energy of zinc vacancies decreases with the increasing Mg content and the zinc vacancies in Mgx Zn1-x O alloys stabilize the ferromagnetic coupling. Our results suggest a viable route to tune the magnetic properties of oxides through band gap and defect engineering. © 2010 American Institute of Physics.


Li D.,Jilin University | Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang H.,Jilin University | Wang Y.,Jilin University
Chemical Society Reviews | Year: 2013

Four-coordinate organoboron compounds with rigid π-conjugated structures are intensely luminescent and have high carrier mobility which enables them to be applied in optoelectronics including organic light-emitting diodes (OLEDs), organic field-effect transistors, as well as photoresponsive, sensory and imaging materials. Various chelate ligands and boron moieties have been explored to construct proper electronic structures and suitable molecular arrangements, which play important roles on the photophysical and electronic properties of the four coordinate boron compounds. These efforts have produced a number of fascinating molecules, some of which have exhibited high performance as light emitting materials. In this article, we provide an overview of the progress in the molecular construction of four-coordinate organoboron compounds with an emphasis on their applications in OLEDs. This journal is © The Royal Society of Chemistry 2013.


Wang D.,Jilin University | Du S.,Jilin University | Zhou X.,Jilin University | Wang B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
CrystEngComm | Year: 2013

Hierarchical hollow ZnO microspheres were prepared via a one-pot template-free hydrothermal synthesis. It's worth mentioning that the hollowness of these microspheres could be controlled by adjusting the zinc source concentration. Furthermore, these microspheres were integrated into a sensorial structure which exhibited fast response and recovery times and good selectivity to ethanol. © 2013 The Royal Society of Chemistry.


Ji W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ji W.,Jilin University | Zhao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sun Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xie W.,Jilin University
Organic Electronics: physics, materials, applications | Year: 2011

A top-emitting warm-white organic light emitting diode (TEWOLED) was fabricated with a conductive transparent MAM cathode [MAM = MoO3 (40 nm)/Ag (17 nm)/MoO3 (40 nm)], which had a higher color rendering index (CRI) than that of corresponding ITO-based bottom-emitting organic light-emitting device (OLED). We measured and calculated the optical transmittance of multilayer MAM fabricated on PET substrate by vacuum thermal evaporation. The average transmittance in visible range is above 84%, which is similar to the conventional indium tin oxide (ITO). The weak microcavity effect on the device performance was also studied. MAM multilayer has the potential for using as transparent conductor electrodes for white OLEDs, especially for flexible devices due to its unique optical and electrical properties. © 2011 Elsevier B.V. All rights reserved.


Li Z.,Jilin University | Cao J.,Jilin University | Cao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao X.,Jilin University | Liu W.,Jilin University
Optics Communications | Year: 2014

As we know that deformable-mirror (DM) is used in the adaptive optics (AO) systems to compensate atmospheric turbulence in free space optical (FSO) communication system. In order to get rid of the limitations generated by the characters of DM itself, the combinational-deformable-mirror (CDM) adaptive optics (CDM-AO) system is established to correct wave-front aberrations and improve coupling efficiency at the receiver. The analysis of the principle of CDM and the decoupling-working principle based on confinement correction algorithm (CCA) is provided, and the comparison of the correcting results between CDM-AO system and conventional AO system are given. Simulation results indicate that CDM-AO system can correct different aberrations with different characteristics and provide better correction performance than single deformable-mirror (DM) AO system. And the coupling efficiency improvement provided by the correction of AO system is numerically evaluated. © 2014 Elsevier B.V.


Liu S.,CAS Dalian Institute of Chemical Physics | Liu S.,Dalian National Laboratory for Clean Energy | Guo X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li M.,CAS Dalian Institute of Chemical Physics | And 4 more authors.
Angewandte Chemie - International Edition | Year: 2011

Wiry solar cells: A solution-phase synthetic approach gave monocrystalline SnSe nanowires with a mean diameter of approximately 20.8 nm and a lattice distance of 0.575 nm (see HRTEM image). Hybrid solar cells based on a blend of these SnSe nanowires and poly(3-hexylthiophene) (P3HT) were fabricated. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Liu Z.,Jilin University | Yu G.,Jilin University | Yao H.,Jilin University | Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
New Journal of Physics | Year: 2012

A π-electronic tight-binding (TB) model with, at most, three independent parameters is found to well fit the density functional theory results about the dispersions of the conduction and valence bands of α-, β-, γ- and (6,6,12)-graphyne. By means of such a toy model, the electron-hole symmetry in these graphynes is demonstrated. An explicit expression of the dispersion relation of α-graphyne is obtained. The position of the Dirac point on a particular Γ-M line in the Brillouin zone of β-graphyne is analytically determined. The absence of Dirac cones in γ-graphyne is intuitively explained. Based on these interesting results, it is believed that this TB model provides a simple but effective theoretical approach for further study of the electronic and transport properties of these typical graphynes. © IOP Publishing and Deutsche Physikalische Gesellschaft.


Xia L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xia L.,University of Chinese Academy of Sciences | Kong X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 8 more authors.
Biomaterials | Year: 2014

Recent advances in NIR triggering upconversion-based photodynamic therapy have led to substantial improvements in upconversion-based nanophotosensitizers. How to obtain the high efficiency of singlet oxygen generation under low 980nm radiation dosage still remains a challenge. A highly efficient nanophotosensitizer, denoted as UCNPs-ZnPc, was constructed for photodynamic therapy, which is based on near infrared (NIR) light upconversion nanoparticle (UCNP) and Zn(II)-phthalocyanine (ZnPc) photosensitizer (PS). The high 1O2 production efficiency came from the enhancement of the 660nm upconversion emission of NaYF4:Yb3+, Er3+ UCNP with 25% Yb3+ doping, covalent assemblage of UCNP and ZnPc which significantly shortened the distance and enhanced the energy transfer between the two. The high 1O2 production led to a secure and efficient PDT treatment, as evidenced by the invivo test where UCNPs-ZnPc of 50mg per kg body weight was locally injected into the liver tumor in mice, a low 980nm radiation dose of 351J/cm2 (0.39W/cm2) and short irradiation duration of 15min were sufficient to perform image-guided PDT and caused the liver tumor inhibitory ratio of approximately 80.1%. Histological analysis revealed no pathological changes and inflammatory response in heart, lung, kidney, liver or spleen. © 2014 Elsevier Ltd.


Liu Z.,CAS Changchun Institute of Applied Chemistry | Liu Z.,University of Chinese Academy of Sciences | Li Z.,CAS Changchun Institute of Applied Chemistry | Li Z.,University of Chinese Academy of Sciences | And 5 more authors.
Biomaterials | Year: 2012

Nanoparticulate imaging agents offer excellent diagnostic and therapeutic capabilities due to their intense and stable output, strong target binding via multiple ligands, as well as tunable biodistribution profiles. In the present work, we designed and synthesized PEGylated Yb 2O 3:Er nanoparticles with high Yb content in single particle (denoted as PEG-UCNPs) suitable for both X-ray CT imaging and up-conversion imaging. These PEG-UCNPs were facile to construct, possessed excellent stability against in vivo environment, and held long blood circulation time. Cell-cytotoxicity assay, hemolyticity, and post-injection histology analysis further demonstrated the excellent biocompatibility, indicating the feasibilities of PEG-UCNPs for in vivo applications. Compared with routinely used Iobitridol in clinic, well-prepared PEG-UCNPs provided much significantly enhanced contrast at a clinical 120 kVp voltage. By doping 5% Er 3+ into the nanoparticles, PEG-UCNPs presented a long-term stable and nearly single-band red up-conversion emission upon continuous irradiation with an assistant of a 980 laser. In addition, pharmacokinetics, biodistribution, as well as clearance of nanoparticles were studied after intravenous injection in a mouse model, reflecting their overall safety. PEG-UCNPs composed of intrinsic up-conversion luminescence property, higher X-ray absorption over Iobitridol, as well as excellent biocompatibility represented a nanoplatform for biomedicine applications. © 2012 Elsevier Ltd.


Xuan X.,Jilin University | Xu S.,Jilin University | Liu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li H.,Jilin University | And 2 more authors.
Journal of Physical Chemistry Letters | Year: 2012

The purpose of this paper is to enhance Raman signals with a plasmonic nanoantenna based on a long-range surface plasmon resonance/probe/silver nanoparticle (LRSPR-P-NP) sandwich configuration. The finite-difference time-domain simulation shows that the electromagnetic field at the gap between the silver film and a silver nanoparticle increases by a factor of about 2.1 × 10 4. The resonance condition of this plasmonic nanoantenna was optimized by incident angle-dependent surface-enhanced Raman scattering (SERS) spectroscopy under an evanescent field excitation mode. The SERS signal obtained under the LRSPR-P-NP configuration at the LRSPR angle was 40 times higher than that collected on the planar film plasmonic nanoantenna. The enhancement factor of the LRSPR-P-NP configuration was 9.2 × 10 8. This plasmonic nanoantenna was also applied for pH sensing. © 2012 American Chemical Society.


Liang Y.,Jilin University | Han Z.,Jilin University | Lin Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ren L.,Jilin University
International Journal of Refractory Metals and Hard Materials | Year: 2012

The SHS reaction behavior of the Cu-Ti-C system with various Cu contents was investigated. The Cu addition not only serves as diluent and binder, but also plays an important role in the ignition behavior of the SHS reaction. With the increase of Cu content, the combustion temperature decreases greatly, the ignition time decreases remarkably first and increases. With the addition of 20 wt.% Cu, the system exhibits the shortest ignition time. The SHS reactions consist of two consecutive combustion stages with different brightness intensity. The two combustion stages mainly correspond to the formation of Ti xCu y compounds and TiC particulates, respectively. The products of the SHS reaction in the Cu-Ti-C system with various Cu contents (10-50 wt.%) consist of TiC and Cu without any intermediate phases. With the increase in the Cu reactant, the size of the TiC particulates decreases considerably. © 2012 Published by Elsevier Ltd.


Li D.,Jilin University | Wang K.,Jilin University | Huang S.,Jilin University | Qu S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Journal of Materials Chemistry | Year: 2011

Two π-conjugated organoboron complexes 1 and 2 with highly efficient red (632 nm) and deep red (670 nm) solid-state fluorescence have been constructed and qualified as potential non-doped red emitters accompanied by excellent electron-transport ability. X-ray crystal analysis demonstrated that the two side phenyl groups coordinated to each boron atom effectively keep the luminescent units apart. As a result, these red fluorophores are brightly fluorescent in the solid state (fluorescence quantum yields: 0.30 for 1 and 0.41 for 2). In addition, these boron complexes possess good thermal stability and high electron-transport ability. Organic light-emitting diodes employing 1 or 2 as non-doped emitters with simple device configuration exhibit bright red and near-infared electroluminescence. © 2011 The Royal Society of Chemistry.


Tian H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | He Z.,Tsinghua University | Li Z.,Tsinghua University
Energy and Buildings | Year: 2015

Abstract: A combined cooling solution is proposed to improve both thermal and energy performance for data centers with high heat density. Multi-stage heat pipe is introduced to make the internally cooled rack, which helps to illuminate the undesired mixing of hot and cold air, and makes a uniform distribution of indoor temperature. A water loop of multi cold sources is designed to make full use of waterside free cooling potentials. With the switchable and flexible operating mode, an energy efficient cooling can be expected. An operating data center in Beijing is studied and retrofitted using this solution. A comparative measurement is performed to validate the effectiveness of this combined cooling solution, which shows an improved indoor thermal environment and reduces annual cooling cost by approximate 46%. © 2015 Published by Elsevier B.V.


Shao D.,Jilin University | Zeng Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fan Z.,Jilin University | Li J.,Jilin University | And 6 more authors.
Biomaterials | Year: 2012

To be able to label a gene and monitor its migration are key important approaches for the clinical application of cancer suicide gene therapy. Photonic nanomaterials are introduced in this work. One of the most promised suicide genes - herpes simplex virus thymidine kinase (HSV-TK) gene - is successfully linked with CdTe/CdS core/shell quantum dots (QDs) via EDC/NHS coupling method. From confocal microscopy it was demonstrated that plasmid TK intracellular trafficking can be effectively and distinctly traced via monitoring the luminescence of the QDs up to 96 h after transfection of QDs-TK conjugates into Hela cells. MTT results show that the QDs-TK conjugates have a high efficient cytotoxicity after adding GCV into Hela cells, whereas the QDs exert no detectable deleterious effects on the cellular processes. The apoptosis induced by QDs-TK conjugates with GCV is distinctly traced partly due to the strong luminescence of the QDs. Our results indicate that photonic nanomaterials, e.g. QDs, provide a tool for monitoring TK gene delivery and anti-cancer activity. © 2012 Elsevier Ltd.


Ding M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ding M.,University of Chinese Academy of Sciences | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yao B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Applied Physics Letters | Year: 2011

Reproducible and high quality N-doped ZnO (ZnO:N) films were achieved by a hydrothermal treatment method. The ZnO:N films exhibited p-type characteristics by means of the Hall-effect and the photoluminescence measurements. At room temperature, the electrical properties of ZnO:N film showed a hole concentration of 1× 1016 cm-3 and hole mobility of 8.6 cm2 V -1 s-1. At 83 K two acceptor related emission peaks could be observed located at 3.353 and 3.237 eV, which were assigned to the acceptor-bound exciton and the donor-acceptor pair emissions. This result gave a direct evidence for the generation of the acceptor energy level after the hydrothermal treatment process. Also, a ZnO homojunction diode was fabricated by this method, which displayed a good rectification characteristic at room temperature. This study revealed that the hydrothermal treatment method was effective and practicable in producing p-type ZnO. © 2011 American Institute of Physics.


Li H.,Jilin University | Gu Y.,Jilin University | Guo H.,Jilin University | Wang X.,Jilin University | And 3 more authors.
Journal of Physical Chemistry C | Year: 2012

The purpose of this article is to improve the collection efficiency of surface-enhanced Raman scattering (SERS) further to increase SERS detection sensitivity in trace detection. To achieve this, a silver nanowell array substrate was designed based on its tunable propagating surface plasmons. This substrate supported directional surface plasmon coupling emission and could guide SERS to the vertical direction of the substrate. Silver nanoparticles were assembled on the shallow silver nanowell array to contribute localized surface plasmons for higher electromagnetic enhancement. Spatial SERS radiation patterns on the silver nanoparticle assembled nanowell array substrate were simulated by the finite-difference time-domain method and recorded by a self-made 3D angle-resolved Raman spectrometer. The results showed that SERS signals were strong and unidirectional in space. The half divergence angle of the SERS pattern was about 10°, which would facilitate SERS collection by using a conventional backscattering Raman spectrometer. This silver nanowell array is supposed to be an applicable configuration to many systems that require high collection efficiency like single-molecule SERS detection and tip-enhanced Raman spectroscopy. © 2012 American Chemical Society.


Wang X.,Jilin University | Zhang M.-M.,Jilin University | Yu X.,PLA Air Force Aviation University | Zhang M.-C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2012

An improved Iterative Closest Point (ICP) method based on the boundary feature points of the point cloud is proposed to improve the efficiency and accuracy of point cloud data registration in reverse engineering fields. First, an initial registration method based on the boundary feature points of point cloud is proposed. The method partitions the minimum bounding box of point cloud with grids in a 3D space, and sets up the space grid model. Then, it applies boundary seed grid recognition and growth algorithms to extract feature points from the boundary of point cloud, and works out the transformation matrix using Singular Value Decomposition (SVD) method to get the results of initial registration. Furthermore, an improved ICP accurate registration method is presented. It weighs the corresponding points of the point cloud, eliminates the points whose weight is larger than the threshold, and introduces M-estimation to the objective function to eliminate the abnormal points. Finally, the point cloud is accurately registered by the improved ICP method on the basis of initial registration.compared with original ICP method, the improved ICP method increases the efficiency by more than 70 percent and reduces the error to 0.02 percent. The experiment results indicate that the method proposed in this paper improves the efficiency and accuracy of point cloud registration greatly.


Yan B.,Jilin University | Zhang Y.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Physics B | Year: 2013

The potential energy curves for neutrals and multiply charged ions of carbon monosulfide are computed with highly correlated multi-reference configuration interaction wavefunctions. The correlations of inner-shell electrons with the scalar relativistic effects are included in the present computations. The spectroscopic constants, dissociation energies, ionization energies for ground and low-lying excited states together with corresponding electronic configurations of ions are obtained, and a good agreement between the present work and existing experiments is found. No theoretical evidence is found for the adiabatically stable CSq+ (q > 2) ions according to the present ab initio calculations. The calculated values for 1st-6th ionization energies are 11.25, 32.66, 64.82,106.25,159.75, and 224.64 eV, respectively. The kinetic energy release data of fragments are provided by the present work for further experimental comparisons. © 2013 Chinese Physical Society and IOP Publishing Ltd.


Jin Y.,Chongqing University of Technology | Jin Y.,Chongqing University | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qin W.,Jilin University
Journal of Alloys and Compounds | Year: 2013

A red-emitting Gd3PO7:5% Eu3+ phosphor is reported. Through transitions of 5d→ 4f (7F1 and 7F2) in Eu3+, the phosphor shows a bright red emission under ultraviolet (UV) light excitation. The emission intensity at 615 nm corresponding to 5D0→7F2 transition of Eu3+ ion depending on irradiation time under 394 nm excitation increases firstly and then small reduces. After 20 min for UV-light irradiation, it decreases by about 0.5% suggesting that the photostability of the red phosphor Gd3PO7:Eu3+ is excellent. Under 325 nm excitation, the emission intensities grow rapidly as the temperature increases from 75 K to 285 K and then it keeps on growing slowly until 475 K, revealing the excellent thermostability of the red phosphor Gd 3PO7:Eu3+. Decay time and time-resolved luminescence measurements have also been studied. All the results reveal that Gd3PO7:Eu3+ is a promising red-emitting phosphor for UV LED applications. © 2013 Elsevier B.V. All rights reserved.


Liu Q.,Jilin University | Zhou X.,Jilin University | Xu P.,Jilin University | Zou Q.,Jilin University | Lin C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
International Journal of Advanced Manufacturing Technology | Year: 2012

This paper describes the development of the fast tool servo (FTS) in detail and categorizes existing FTSs according to different principles. The characteristics and differences of these FTSs have been analyzed. A flexurebased long-stroke FTS system for diamond turning is presented with displacement range of 1 mm and bandwidths of 10 Hz. The vertical jump is about 0.045 μm, and the full stroke tracking error is less than 0.15%. A voice coil motor and a piezoelectric actuator are used as the driving elements, and two flexure hinges are developed as the guide mechanisms. The FTS utilizes a linear encoder and a capacitive sensor to measure the displacement of the tool for closed-loop control. The electromechanical design of the FTS and its motion analysis are described. Experimental tests have been carried out to verify the performance of the FTS system. This long-stroke FTS has the advantage of easy machining, high resonance frequency, and error compensation in y-axis direction. © Springer-Verlag London Limited 2011.


Wang L.,Jilin University | Zhu S.-J.,Jilin University | Wang H.-Y.,Jilin University | Qu S.-N.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 7 more authors.
ACS Nano | Year: 2014

Carbon nanodots (C-dots) synthesized by electrochemical ablation and small molecule carbonization, as well as graphene quantum dots (GQDs) fabricated by solvothermally cutting graphene oxide, are three kinds of typical green fluorescence carbon nanomaterials. Insight into the photoluminescence origin in these fluorescent carbon nanomaterials is one of the important matters of current debates. Here, a common origin of green luminescence in these C-dots and GQDs is unraveled by ultrafast spectroscopy. According to the change of surface functional groups during surface chemical reduction experiments, which are also accompanied by obvious emission-type transform, these common green luminescence emission centers that emerge in these C-dots and GQDs synthesized by bottom-up and top-down methods are unambiguously assigned to special edge states consisting of several carbon atoms on the edge of carbon backbone and functional groups with C-O (carbonyl and carboxyl groups). Our findings further suggest that the competition among various emission centers (bright edge states) and traps dominates the optical properties of these fluorescent carbon nanomaterials. © 2014 American Chemical Society.


Zhang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Z.,Tohoku University | Peng H.,Tohoku University | Yan J.,Keio University
International Journal of Machine Tools and Manufacture | Year: 2013

To fabricate three-dimensional microstructures, such as micro dimples, micro grooves and micro channels, on ceramic mold materials, tool fabrication with super hard materials is an essential step. In this work, micro electro discharge machining (EDM) was used to fabricate high-precision polycrystalline diamond end mills. Form accuracy and edge sharpness in one micron level were achieved by utilizing electro discharge induced graphitization of diamond grains under extremely low discharge energy conditions. The cutting performance of the fabricated tools was examined by machining micro dimples and micro grooves on tungsten carbide mold substrates. Results showed that using the EDMfabricated tools, ductile mode machining of tungsten carbide was realized with a surface finish of 2 nm Ra, which is comparable to that produced by polishing. © 2012 Elsevier Ltd. All rights reserved.


Ding M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ding M.,University of Chinese Academy of Sciences | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yao B.,Jilin University | And 5 more authors.
Optics Express | Year: 2012

The ZnO microwires with quadrate cross section were synthesized by chemical vapor deposition method. The ultraviolet laser with the Fabry-pérot cavity modes was realized from an individual ZnO microwire. Under the low excitation power densities, the amplified spontaneous emission was observed from the ZnO microwire, while the lasing action was observed under the high excitation power densities. The ZnO microwire exhibited low threshold excitation intensity of 58 kW/cm2 and quality factor of 485. The characteristics and possible lasing mechanism were investigated in detail. © 2012 Optical Society of America.


Li F.,Jilin University | Li C.,Jilin University | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen Y.,Changchun Obstetrics and Gynecology Hospital | And 4 more authors.
Chemistry - A European Journal | Year: 2012

Monodisperse water-soluble hexagonal phase Ln3+-doped NaGdF 4 upconverting nanocrystals (UCNCs) have been successfully fabricated by means of a fast, facile, and environmentally friendly microwave-assisted route with polyethylenimine as the surfactant. Fine-tuning of the UC emission from visible to near-IR and finally to white light has been achieved. Furthermore, studies of the magnetic resonance imaging as well as the magnetization (magnetization-magnetic field curves) and the targeted recognition properties of FA-coupled amine-functionalized NaGdF4@SiO2 UCNCs indicate that the obtained NaGdF4 UCNCs can be potential candidates for dual-mode optical/magnetic bioapplications. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Cheng X.,Jilin University | Li D.,Jilin University | Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Z.,Jilin University | And 2 more authors.
Organic Letters | Year: 2014

A novel family of organoboron compounds 1-4 with bright near-infrared (NIR) emissions in the crystalline state was synthesized. They show a morphology-dependent emission "ON" and "OFF" feature and volatile acid/base-induced fluorescence saltation which allow the realization of reversible solid-state fluorescence switching in the NIR region by totally different procedures: mechanical grinding/solvent annealing and acid/base vapor fuming. © 2014 American Chemical Society.


Tong S.,Jilin University | Zhao S.,Jilin University | Zhou W.,Jilin University | Li R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jia Q.,Jilin University
Microchimica Acta | Year: 2011

We have prepared an environmental friendly sorbent by modifying multi-walled carbon nanotubes with tannic acid. The adsorption of La (III), Tb (III) and Lu (III) as a function of contact time, initial solution pH, and quantity of adsorbent was studied using a batch technique. Both Langmuir and Freundlich isotherms can be used to describe the process. The major adsorption mechanisms were attributed to ion exchange and surface complexation. The kinetics of the adsorption follows a pseudo-second-order model. The thermodynamic functions ΔH, ΔG, and ΔS indicate that the sorption is endothermically driven. The adsorbed ions can be readily desorbed from the surface with 1 M hydrochloric acid. © 2011 Springer-Verlag.


Yang Z.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fang W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yang Y.-Q.,Harbin Institute of Technology
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013

Two-photon-excited fluorescence (TPEF) enhancement effect in CdSe quantum dot modified Au nanoparticle was theoretically investigated. TPEF enhancement factor was obtained in dipole approximation by taking surface plasmon resonance enhancement effect and nonradiative energy transfer to Au NP into account. An available method to achieve sufficient TPEF enhancement factor with noble metal nanoparticles was concluded from the analysis of numerical simulation. Greater TPEF enhancement effect will be obtained by adjusting the surface plasmon resonant peak of noble metal nanoparticles to the excitation wavelength. This theoretical analysis result was proved to be appropriate to the reported experimental results.


Peng J.,Harbin Institute of Technology | Li S.,Harbin Institute of Technology | Han H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Physics Letters | Year: 2014

Aiming to suppress high frequency vibrations of a torque motor in electrohydraulic servo-valves, damping properties of an ester-based Fe 3O4 magnetic fluid operating in the squeeze mode are studied in this Letter. The expression of damping forces due to the magnetic fluid on the torque motor is derived and simplified based on the measured magneto-viscosity property. Dynamic characteristics of the torque motor with and without the magnetic fluid are simulated and tested. Damping properties of magnetic fluid for the vibration suppression of a torque motor are verified by the good agreement between the predicted and tested results. © 2014 AIP Publishing LLC.


Su Z.,Jiangnan University | Xue D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ji Z.,Jiangnan University
Optics Express | Year: 2012

We propose a numerical optimization method designing LED array for achieving a good uniform illumination distribution on target plane. Simulated annealing algorithm is employed to optimize LED array arrangement. Using the method, we optimized three LED arrays with various luminous intensity profiles. In order to exhibit the design freedom of the method, we use some LEDs with different intensity value in the first and third array, respectively. By optimizing, the three arrays all produced highly uniform illumination distribution with the uniformity of 0.12, 0.23 and 0.13, respectively. It indicates our method can design various luminous intensity distribution LED arrays and design array consisting of LEDs with different intensity value. In addition, the method is simple and can optimize the LED array automatically by computer program. To the best of our knowledge, it is first time to use numerical optimization method to design the optimal LED array arrangement for uniform irradiance. © 2012 Optical Society of America.


Jia P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhou M.,Harbin Institute of Technology
Chinese Journal of Mechanical Engineering (English Edition) | Year: 2012

For the technology of diamond cutting of optical glass, the high tool wear rate is a main reason for hindering the practical application of this technology. Many researches on diamond tool wear in glass cutting rest on wear phenomenon describing simply without analyzing the genesis of wear phenomenon and interpreting the formation process of tool wear in mechanics. For in depth understanding of the tool wear and its effect on surface roughness in diamond cutting of glass, experiments of diamond turning with cutting distance increasing gradually are carried out on soda-lime glass. The wear morphology of rake face and flank face, the corresponding surface features of workpiece and the surface roughness, and the material compositions of flank wear area are detected. Experimental results indicate that the flank wear is predominant in diamond cutting glass and the flank wear land is characterized by micro-grooves, some smooth crater on the rake face is also seen. The surface roughness begins to increase rapidly, when the cutting mode changes from ductile to brittle for the aggravation of tool wear with the cutting distance over 150 m. The main mechanisms of inducing tool wear in diamond cutting of glass are diffusion, mechanical friction, thermo-chemical action and abrasive wear. The proposed research makes analysis and research from wear mechanism on the tool wear and its effect on surface roughness in diamond cutting of glass, and provides theoretical basis for minimizing the tool wear in diamond cutting brittle materials, such as optical glass. © Chinese Mechanical Engineering Society and Springer-Verlag Berlin Heidelberg 2012.


Lu H.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu Y.,Harbin Institute of Technology | Guo Y.-F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2012

According to the imaging gaps caused by scrolling imaging in the conventional assembled focal plane for a push-broom camera, a mechanical assembling method with uneven overlapping pixels was proposed. Firstly, a model was established to simulate the imaging process when the camera was scrolled. Then, the reason that the gaps appear was analyzed, and a mathematical formula for the gaps between the CCD viewing fields at a certain scrolling angle was derived. Accordingly, the allowable minimum quantity of the overlapping pixels between every two CCDs was derived as well. On these bases, a function of overlapping pixels of images was given for subsequent software programs to eliminate the superfluous pixels and to realize the gapless assembly. Analysis indicates that the error ε of this assembling method is less than one pixel, which satisfies |ε/D|<1. Finally, an example was given.


Lou J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu L.,Harbin Institute of Technology | Ma L.,Harbin Institute of Technology | Xiong J.,Harbin Institute of Technology | Wang B.,Harbin Institute of Technology
Composites Part B: Engineering | Year: 2014

The effects of local damage on the natural frequencies and the corresponding vibration modes of composite pyramidal truss core sandwich structures are studied in the present paper. Hot press molding method is used to fabricate intact and damaged pyramidal truss core sandwich structures, and modal testing is carried out to obtain their natural frequencies. A FEM model is also constructed to investigate their vibration characteristics numerically. It is found that the calculated natural frequencies are in relatively good agreement with the measured results. By using the experimentally validated FEM model, a series of numerical analyses are conducted to further explore the effects of damage extent, damage location, damage form on the vibration characteristics of composite pyramidal truss core sandwich structures as well as the influence of boundary conditions. The conclusion derived from this study is expected to be useful for analyzing practical problems related to structural health monitoring of composite lattice sandwich structures. © 2014 Elsevier Ltd. All rights reserved.


Fan X.,Harbin Institute of Technology | Liu J.,Harbin Institute of Technology | Wu J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics Letters | Year: 2010

The phase noises of a 10-m polarization-maintaining (PM) fiber and a 10-W PM fiber amplifier are experimentally measured. The results indicate that the 10-m PM fiber with similar phase noise could be used to investigate the architecture of master oscillator power amplifier coherent combination. A seven-element hexagonal fiber coherent array is developed to investigate the far-field distribution and phase controlling technique of a coherently combining fiber laser array. A hexagonal prism is designed as the combining and splitting component to achieve a fill factor of 0.66. The hill climbing method is employed to detect and lock the element phase. © 2010 Chinese Optics Letters..


Tian H.,Harbin Institute of Technology | Yao B.,Harbin Institute of Technology | Zhou Z.,Harbin Institute of Technology | Wang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Physics Express | Year: 2012

Paraelectric potassium sodium tantalate niobate (KNTN) crystals have been grown with two different Mn concentrations, namely, 0.25 and 0.5 mol %. High voltage-controlled diffraction efficiencies of 79 and 74%, and large two-wave mixing gains of 36 and 32 cm -1 were achieved for the 1.0mm thick 0.25 and 0.5 mol% Mn-doped KNTN samples, respectively. The amplitude modulation of the diffracted beam by an AC external field at a frequency of 100 Hz was demonstrated. The results show that Mn-doped KNTN is a promising material for voltage-controlled diffractive applications. © 2012 The Japan Society of Applied Physics.


Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Stockman M.I.,Georgia State University
Physical Review Letters | Year: 2013

We consider theoretically the spaser that is excited electrically via a nanowire with ballistic quantum conductance. We show that, in the extreme quantum regime, i.e., for a single conductance-quantum nanowire, the spaser with a core made of common plasmonic metals, such as silver and gold, is fundamentally possible. For ballistic nanowires with multiple-quanta or nonquantized conductance, the performance of the spaser is enhanced in comparison with the extreme quantum limit. The electrically pumped spaser is promising as an optical source, nanoamplifier, and digital logic device for optoelectronic information processing with a speed of ∼100 GHz to ∼100 THz. © 2013 American Physical Society.


Liu Y.,Zhejiang University of Technology | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
IEEE Photonics Technology Letters | Year: 2012

We find strong intensity modulations in surface plasmon polaritons (SPPs) by changing the refractive index and thickness (i.e., the optical length) of the dielectric layer in metal-dielectric nanodevices. We interpret the phenomena by considering the dielectric layer as a Fabry-Pérot cavity. Analysis from finite-difference time-domain numerical studies reveals that the strong periodic variation of the enhancement in SPP fields is due to alternating constructive and destructive interference of optical waves in the dielectric layer. The present results can be applied in designing planar metal-dielectric nanodevices that require optical intensity modulation or high-field enhancement, such as optical switches or thin-film solar cells. © 2012 IEEE.


Cao S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao S.,University of Chinese Academy of Sciences | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Applied Physics Letters | Year: 2013

We report the extraordinary light harvesting property of a metamaterial-based subwavelength nanopillar array with a periodic arrangement. It is found that the meta-nanopillar array can absorb light efficiently with an average absorptivity of 0.96 over the whole visible waveband with independent of the incoming light polarization state as well as the wide receiving angle of as large as ±60°. We attribute the efficient light harvesting property of meta-nanopillar array to the synergistic effect of the slow light mode and localized surface plasmon resonant effect. © 2013 AIP Publishing LLC.


Liu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu H.,Zhejiang University of Technology
Journal of Micro/Nanolithography, MEMS, and MOEMS | Year: 2010

The finite-difference time-domain (FDTD) method is used as rigorous electromagnetic analysis model to calculate the field for a diffractive microlens (DML). The FDTD is used for the entire solution rather than using a near- to far-field propagation method to obtain the far-field energy distribution; thus, all the results are vector based. We derived a formula to calculate the magnitude of electric field, which is time dependent and can be used to graphically show the light wave propagation and focusing process through a DML. Both the comparison and the integral methods are presented to obtain wave amplitude in full solution space,and the distribution of light energy behind a DML is illustrated based on the wave amplitude. The formula of diffractive efficiency of the DML is derived from a time-averaged Ponyting vector, which can indicate the propagation direction of light energy. Application of these formulations in the analysis of a DML example demonstrates the high accuracy and efficiency of our method. © 2010 Society of Photo-Optical Instrumentation Engineers.


Zhao J.-C.,Aviation Commissary of Navy in Changchun | Guo R.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sun T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

Shipborne laser weapons provide complements for traditional shipborne weapons and they have been given much attention by many countries in the world. This paper introduces the history of shipborn laser weapons, and analyzes their compositions, functions and key technologies. Then, it points out that the development of shipborne laser weapons will focus on the free electron lasers and optical fiber lasers, and the low-energy lasers with small weights and volumes are expected to used in shipborne laser weapons. Actually, the shipborne laser weapons will develop toward the direction of miniaturization and high efficiency.


Zhao J.-C.,Aviation Commissary of Navy in Changchun | Wang D.-N.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen C.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guo J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

An experiment platform for laser active imaging and target recognition was built combining a laser active image system and the target recognition technology, and the target recognition after laser active imaging was mainly researched. The feature vector was comprised of seven invariant Hu moments. The BP neural network algorithm comprised of 136 weight coefficients was used to study the moving target, a 43 submachine gun model at 450 m from the experiment platform at night, and excellent experiment results were obtained. It shows clear imaging effects by 68.87% of target recognition statistic probability in 2 740 frames of laser active imaging, and the probability of rotation transformation reaches 80.05%. These researches are significant to the detection and recognition of little targets at night.


Liu Y.,Zhejiang University of Technology | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Modern Optics | Year: 2012

A systematic finite-difference time-domain method, established in the cylindrical coordinate and integrated with the six-pole Lorentz-Drude model using the auxiliary differential equation method, is formulated. The model is appropriate for analyzing metal photonic devices with an axially symmetric nanostructure, such as metal nanowires, metal particles, and plasmonic lenses. As an example, an experimentally demonstrated plasmonic lens is analyzed based on the Drude model, the Lorentz-Drude model, and the Lorentz model. Depending on the different dispersion models, distinct electric field distributions for the plasmonic lens are obtained. The interesting numerical results, which are explained in this paper, show the high efficiency and accuracy of the simulation model. © 2012 Copyright Taylor and Francis Group, LLC.


Wang Y.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang S.-J.,Nanjing Institute of Technology
Chinese Optics | Year: 2014

In order to improve the consistency of the assessment result of image fusion with that of Human Visual System, the state-of-the-art image fusion assessment methods are deeply analysed, then a new assessment method is proposed in this paper, which is based on the complex number expression for image structure. The gradient information of luminance layer of color image is used to perform the task. When it is used to describe image structure, more human visual system-sensitive information are contain in the corresponding complex matrix. Due to the calculation problem of mutual information, we perform singular value decomposition on the complex matrix, and the singular value vector of each image block is used to construct the new matrix. Results from experiments show that the proposed method gives evaluation of 3.7485 and 3.7222 for pyramid and DWT methods. It improves the consistency of assessment results with those of human visual system.


Wang L.,Jiangxi Normal University | Lu X.,Jiangxi Normal University | Ye Y.,Jiangxi Normal University | Sun L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Song Y.,Jiangxi Normal University
Electrochimica Acta | Year: 2013

Nickel-cobalt nanostructures (Ni-Co NSs) electrodeposited on reduced graphene oxide (RGO)-modified glassy carbon electrode (GCE) was prepared and used for highly sensitive glucose detection. RGO nanosheets were firstly assembled onto GCE surface by π-π interaction and then Ni-Co NSs were constructed on RGO/GCE by dynamic potential scan. The electrochemical and electrocatalytic behaviors of the Ni-Co NSs/RGO/GCE toward glucose oxidation were evaluated by cyclic voltammograms, chronoamperometry and amperometric method. The effects of some factors related to the fabrication of Ni-Co NSs/RGO/GCE, such as potential scan number and the molar ratio of Ni 2+/Co2+ in a solution, on the catalytic performance of the Ni-Co NSs/RGO/GCE were also explored. The results showed that the Ni-Co NSs/RGO/GCE exhibited the best catalytic activity at the potential scan number of 20 and the Ni2+/Co2+ molar ratio of 1:1. The glucose concentration in the range of 10 μM to 2.65 mM linearly depended on the catalytic current (r = 0.9967, n = 17). The sensitivity was 1773.61 μA cm-2 mM-1, and the detection limit was 3.79 μM (S/N = 3). This high catalytic activity, good sensitivity and stability of the Ni-Co NSs/RGO/GCE sensor opened up a new kind of hybrid materials in electrochemical detection of glucose. © 2013 Elsevier Ltd. All rights reserved.


Wang L.,Jiangxi Normal University | Ye Y.,Jiangxi Normal University | Lu X.,Jiangxi Normal University | Wu Y.,Jiangxi Normal University | And 4 more authors.
Electrochimica Acta | Year: 2013

Detection of H2O2 is very important in biological analysis, clinical diagnosis, food industry, etc. This work presents an electrochemical approach for the detection of H2O2 based on Prussian blue (PB) nanocubes-nitrobenzene-reduced graphene oxide (RGO) nanocomposites (PB nanocubes-nitrobenzene-RGO). The hybrid nanocomposites were constructed by growing PB nanocubes onto the nitrobenzene-RGO composites which were prepared by spontaneous grafting nitrophenyl groups to the basal carbon atoms of RGO based on chemical bonding. The obtained PB nanocubes-nitrobenzene- RGO nanocomposites were characterized by scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The formation mechanism of PB nanocubes-nitrobenzene-RGO nanocomposites was investigated and discussed in detail. The PB nanocubes-nitrobenzene-RGO modified glassy carbon electrode shows good electrocatalysis toward the reduction of H2O2. The resulted H2O2 biosensor exhibited a rapid response of 2 s, a low detection limit of 0.4 μM, a wide linear range of 1.2 μM to 15.25 mM and high sensitivity of 300.16 μA cm-2 mM-1, as well as good stability, repeatability and selectivity. Further immobilizing glucose oxidase on the PB nanocubes-nitrobenzene-RGO nanocomposites/GCE, an amperometric glucose biosensor was achieved by monitoring the generated H 2O2 under a relatively negative potential. The sensors might be used as a promising one for practical application. © 2013 Elsevier Ltd. All rights reserved.


Song Y.,Jiangxi Normal University | Li X.,Jiangxi Normal University | Sun L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang L.,Jiangxi Normal University
RSC Advances | Year: 2015

Metal-organic frameworks (MOFs) have important potential applications in gas separation, storage and purification, and also for use as electrode materials, catalysts, sensors and in drug-delivery systems. There has been increasing interest in the synthesis of micro- and nanostructures based on MOFs, particularly on the improvement of their versatility and the simplification of synthesis procedures. This paper reviews the use of MOFs as matrices for solid-state decomposition and in the synthesis of metal/metal oxide micro- and nanostructures, porous carbon and composite materials. This journal is © The Royal Society of Chemistry 2015.


Wang L.,Jiangxi Normal University | Zheng Y.,Jiangxi Normal University | Lu X.,Jiangxi Normal University | Li Z.,CAS Changchun Institute of Applied Chemistry | And 2 more authors.
Sensors and Actuators, B: Chemical | Year: 2014

A novel nonenzymatic glucose sensor was developed by electrodepositing dendritic copper-cobalt nanostructures (Cu-Co NSs) on glassy carbon electrode (GCE) which was modified by reduced grapheme oxide-chitosan (RGO-CHIT) nanocomposites. The electrochemical behaviors and electrocatalytic performances of the sensor towards oxidation of glucose were evaluated by cyclic voltammograms, chronoamperometry and amperometric method. Compared to sensors based on monometal Cu or Co NSs, the sensor based on bimetal Cu-Co NSs exhibits good electrocatalytic activity towards oxidation of glucose. The effects of electrodeposition time and the ratio of Cu2+ and Co2+ in an electrodeposition solution on the electrocatalytic performance of the Cu-Co NSs sensor were explored in detail. The best catalytic activity towards oxidation of glucose can be achieved under an optimized condition: electrodepositing time of 2600 s and the Cu2+/Co2+ molar ratio of 2:1. The catalytic current density is linear to the glucose concentration in the range of 0.015-6.95 mM (r = 0.9947) with a sensitivity of 1921 μA cm-2 mM-1, and a detection limit of 10 μM. The good catalytic activity, high sensitivity and good stability indicate that the newly developed sensor based on the dendritic Cu-Co NSs/RGO-CHIT/GCE is a promising sensor for application in real samples. © 2014 Elsevier B.V.


Xing X.,Beijing Jiaotong University | Jing T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cheng W.,George Washington University | Huo Y.,Beijing Jiaotong University | Cheng X.,University of Minnesota
IEEE Wireless Communications | Year: 2013

Spectrum sensing, spectrum decision, spectrum sharing, and spectrum mobility are four major functions of cognitive radio systems. Spectrum sensing is utilized to observe the spectrum occupancy status and recognize the channel availability, while CR users dynamically access the available channels through the regulation processes of spectrum decision, spectrum sharing, and spectrum mobility. To alleviate the processing delays involved in these four functions and to improve the efficiency of spectrum utilization, spectrum prediction for cognitive radio networks has been extensively studied in the literature. This article surveys the state of the art of spectrum prediction in cognitive radio networks. We summarize the major spectrum prediction techniques, illustrate their applications, and present the relevant open research challenges. © 2002-2012 IEEE.


Zhang M.-H.,PLA Air Force Aviation University | Zhang Y.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012 - Proceedings | Year: 2012

Mammary gland is composed entirely of soft tissue with approximate density, therefore mammary gland CR medicine radiation image presents a low contrast, and slight difference changes may be a manifestation of tumor, so it is necessary to enhance mammary gland CR image to improve its visual quality in order to meet the demands of doctor's clinical diagnosis. However the general enhancement algorithms over enhance the contrast and noise, due to image details lost, aiming at the defects, a mammary gland CR medicine image adaptive enhancement arithmetic based on image gray entropy is put forward. The arithmetic adapts dizzy image to magnify selected spatial frequency response in order to enhance the edge details of mammary gland CR images. It can adjust weighted factor K according to image gray characteristics namely pixel gray entropy. Experiments results demonstrate that mammary gland CR image enhanced by the algorithm has abundant details and high signal-to-noise ratio, moreover, CR image enhanced has good visual effect. So the method is effective and fit for enhancing CR medical radiation image edge details. © 2012 IEEE.


Qiu C.,Wuhan University | Hao R.,Wuhan University | Li F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu S.,Wuhan University | Liu Z.,Wuhan University
Applied Physics Letters | Year: 2012

We report an anomalous transmission enhancement of acoustic waves through a hybrid grating. The fundamental physics behind this phenomenon can be captured well by the improved impedance matching between the hybrid grating and the background fluid. This type of acoustic transparency is broadband and can be robust against the incident angle, which is drastically different from the previously reported mechanisms that are closely related with resonances. Potential applications of this effect can be anticipated in ultrasonic devices. © 2012 American Institute of Physics.


He X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cheng X.,CAS Suzhou Institute of Biomedical Engineering and Technology
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | Year: 2015

Diffraction efficiency reflects the design and ruling quality of grating, which is essential for the users and manufacturers. Aiming at the development of China's first 500 mm × 400 mm echelle ruling machine, it is necessary to establish a measurement instrument for the diffraction efficiency test to quantitatively evaluate the manufacture level of grating and provide necessary tools for the grating design and manufacture process improvement. Based on serial dispersion subtraction principle, the optical path of conventional C-T structured measuring monochromator is improved. The optical path between pre-monochromator and measurement monochromator is optimized jointly. The multidimensional adjustment stage for grating under test and probe assembly are designed. The calibration method for three grating scanning pre-monochromator with N. A. of 0.1 and the systemati0c error correction method of the test instrument are proposed. Calibration results of pre-monochromator show that the spectral output accuracy is ± 2 nm within the wavelength range of 190-1 100 nm, and the open accuracy of the programmable slit is 0.002 mm. The measurement accuracy of the corrected diffraction efficiency is 2%, and the repeatability accuracy is 0.5%. The preliminary measurement results show that the developed measurement equipment can meet the requirement of diffraction efficiency quantitative measurement of 500 mm × 400 mm large echelle, and achieve the automatic measurement of the continuous curve of diffraction efficiency-wavelength within the operating spectrum range. ©, 2015, Science Press. All right reserved.


Wang Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Q.,University of Chinese Academy of Sciences | Wang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Y.,University of Chinese Academy of Sciences | And 3 more authors.
Optics Letters | Year: 2015

The thermal nonlinear effects in whispering-gallery-mode resonators are characterized by oscillatory behavior in the transmission spectrum. Although the thermal linewidth broadening is proven to be practical in mode-locking and dynamic control of the optical path, the oscillatory behavior always leads to instability of mode-locking and influences the control accuracy. We theoretically and experimentally illustrate the thermal oscillatory behavior using a model that combines slow and fast thermal relaxation processes of the microsphere and fluctuations of the pump wavelength. We also report dynamic modulation of the refractive index based on the fast thermal relaxation process. © 2015 Optical Society of America.


Li K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li K.,University of Chinese Academy of Sciences | Liu G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Talanta | Year: 2014

Sensitive and selective detection for cancer biomarkers is critical in cancer clinical diagnostics. In this work, we report a new optical microfiber (OMF) biosensor using gold nanoparticles (GNPs) as amplification labels for the detection of alpha-fetoprotein (AFP) in serum samples. By combining the unique optical property of OMFs and the strong optical absorption of GNPs, very high sensitivity and selectivity can be achieved. Critical parameters namely fiber diameter and GNP size were optimized for better performance. The limit of detection (LOD) of this sensor for AFP is 0.2 ng/mL in PBS and 2 ng/mL in bovine serum, which is comparable to conventional assays. The advantages of this biosensor are simple detection scheme, fast response time, and ease of miniaturization, which might make this biosensor a promising platform for clinical cancer diagnosis and prognosis. © 2013 Elsevier B.V.


Zhang Z.,CAS Suzhou Institute of Biomedical Engineering and Technology | Wu Y.,CAS Suzhou Institute of Biomedical Engineering and Technology | Wu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Langmuir | Year: 2011

A facile method of obtaining chainlike assemblies of gold nanoparticles (AuNPs) on a chemically modified glass surface based on NaBH4 treatment is developed. Citrate-stabilized AuNPs (17 nm) are immobilized on a glutaraldehyde-functionalized glass surface and assembled into chainlike structures after treatment with aqueous sodium borohydride (NaBH4) solution. The production and morphology of the AuNP chainlike assemblies are controlled by the density of the immobilized NPs, the concentration of NaBH 4 solution, and the treatment time. The AuNP assemblies are stable in water and can undergo drying. X-ray photoelectron spectroscopic data show that the number of citrate ions on the AuNPs decreased by 43% after treatment with 5 mg/mL NaBH4 solution. The NaBH4-induced partial removal of the citrate ions and the roughness of the glass surface greatly affect the binding force of AuNPs on the substrate. The immobilized AuNPs begin to move at the solid-liquid interface without desorbing when the strength of the binding force was decreased. These mobile NPs form chainlike assemblies under the driving force of van der Waals interaction and diffusion. This interface-based formation of chainlike assemblies of AuNPs may provide a simple protocol for the 1D assembly of other Au-coated colloidal nanoparticles. © 2011 American Chemical Society.


Zhang Z.,CAS Suzhou Institute of Biomedical Engineering and Technology | Li H.,CAS Suzhou Institute of Biomedical Engineering and Technology | Zhang F.,CAS Suzhou Institute of Nano Technology and Nano Bionics | Wu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Langmuir | Year: 2014

We present a facile method for fabricating spongelike Au structures by halide-induced aggregation and fusion of gold nanoparticles (AuNPs). Halide ions (F-, Cl-, Br-, and I-) showed distinctly different effects on the synthesized AuNPs, which were characterized by localized surface plasmon resonance (LSPR) and dynamic light scattering measurements. A noticeable red-shift in the LSPR peak was found after Br - and I- ion treatment, which indicates the adsorption of halide atoms or ions on the AuNPs. The surface potential of AuNPs varied by treatment with different types of halides; this finding indicates that different halide ions have different effects on the AuNPs. Br- and I - ions showed strong affinity toward the AuNPs. The different affinities of halide ions toward the AuNPs play an important role in controlling the formation process of spongelike gold. Citrate ions adsorbed on AuNPs were displaced by halide ions to different extents. Such displacement determined the aggregation and fusion behaviors of the AuNPs and eventually the formation of different spongelike structures. © 2014 American Chemical Society.


Jin Y.,Chongqing University of Technology | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Hao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Journal of Alloys and Compounds | Year: 2011

Eu3+ and Sm3+ co-doped CaMoO4 microclews have been successfully synthesized via a facile hydrothermal method directly in surfactant-free environment. The as-prepared phosphor present clew-like agglomerates composed of 40 nm nanosheets under the moderated reaction temperature. The red phosphor CaMoO4:Eu3+, Sm3+ can generate a strong absorption line at 405 nm, originating from 6H5/2 → 6P5/2 transition of Sm3+, which is suitable for the emission of the near-ultraviolet light-emitting diodes (∼400 nm). Energy transfer between Sm3+ and Eu3+ is detected from the varied photoluminescence spectra with different Eu3+ concentrations and the energy transfer mechanism is clarified via the photoluminescence spectra. When Sm3+ is excited (405 nm), the electron is excited from 6H5/2 to 6P5/2, and then relaxed to 4G5/2. It jumps from 4G5/2 to the lower levels corresponding to the emissions of Sm3+; meanwhile, the transfers from 4G 5/2 state of Sm3+ ion to 5D0 state of Eu3+ ion come out. The transition of 5D1 → 7FJ (J = 0, 1, 2) does not appear indicating that the transfer from 4G5/2 state of Sm3+ to 5D0 state rather than 5D1 state of Eu3+ is the energy transfer pathway. © 2011 Elsevier B.V. All rights reserved.


Chen X.,University of Missouri - Kansas City | Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Huang F.,CAS Beijing National Laboratory for Molecular | Huang F.,CAS Shanghai Institute of Ceramics
Chemical Society Reviews | Year: 2015

In the past few decades, there has been a wide research interest in titanium dioxide (TiO2) nanomaterials due to their applications in photocatalytic hydrogen generation and environmental pollution removal. Improving the optical absorption properties of TiO2 nanomaterials has been successfully demonstrated to enhance their photocatalytic activities, especially in the report of black TiO2 nanoparticles. The recent progress in the investigation of black TiO2 nanomaterials has been reviewed here, and special emphasis has been given on their fabrication methods along with their various chemical/physical properties and applications. This journal is © The Royal Society of Chemistry.


Xu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guan Y.-J.,Changchun University of Technology
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

A novel flexible support structure for the 1-m primary mirror of a space camera was introduced. By taking the material selection, diameter-thickness ratio, number and positions of support points, and lightweight forms as design variables and the surface figure accuracy rms of the mirror under the self-weight as objective function, a kind of back opening SiC space mirror with triangle lightweight holes and three-point support on the back was designed optimally. Then, the flexible support structure was designed for the primary mirror. Through sensitivity analysis, the parameters of flexible support structure that effect on rms of mirror were found when its optical axis was on the horizontal state. By using finite element method, the dynamic and static stiffnesses as well as thermal character of the primary mirror subassembly were analyzed. The results indicate that surface accuracy of the mirror has reached rms 5.6 nm and 2.7 nm under gravity perpendicular to optical axis and a uniform temperature rise of 4°C, respectively, and the fundamental frequency of the primary mirror subassembly is 192 Hz. Finally, dynamics test was performed in the laboratory, experimental results indicate that the first-order natural frequency is 197 Hz and the maximum stress is 181 MPa, which verifies the accuracy of FEA. Obtained results satisfy the requirements of space application.


Liang Q.,University of Chinese Academy of Sciences | Wang T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sun Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Advanced Optical Materials | Year: 2013

A two-dimensional pyramidal shape metamaterial-based absorber composed of multiple alternating metallic and dielectric thin films is proposed. This pyramid metamaterial absorber is a broadband, wide-angle, omni-directional and polarization-insensitive light absorbing device. The absorption performance of the absorber is excellent, with an absorptivity of nearly 100% at the infrared waveband from 1 μm to 14 μm for normal incidence. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Yang C.,Nankai University | Yang C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu Q.,Nankai University | Xu J.,Nankai University | And 3 more authors.
Optics Express | Year: 2010

Femtosecond optical pulses were used to generate THz-frequency phonon polariton waves in a 50 micrometer lithium niobate slab, which acts as a subwavelength, anisotropic planar waveguide. The spatial and temporal electric field profiles of the THz waves were recorded for different propagation directions using a polarization gating imaging system, and experimental dispersion curves were determined via a two-dimensional Fourier transform. Dispersion relations for an anisotropic slab waveguide were derived via analytical analysis and found to be in excellent agreement with all observed experimental modes. From the dispersion relations, we analyze the propagation-direction-dependent behavior, effective refractive index values, and generation efficiencies for THz-frequency modes in the subwavelength, anisotropic slab waveguide. © 2010 Optical Society of America.


Lou J.,Ningbo University | Lou J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | He L.,Ningbo University | He L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Composite Structures | Year: 2015

In this paper, the nonlinear bending and free vibration responses of a simply supported functionally graded (FG) microplate lying on an elastic foundation are studied within the framework of the modified couple stress theory and the Kirchhoff/Mindlin plate theory together with the von Karman's geometric nonlinearity. The equations of motion and boundary conditions for the FG microplate are derived from the Hamilton's principle. Due to introducing the physical neutral surface, there is no stretching-bending coupling in the constitutive equations, and the equations of motion become simpler. By using the Galerkin method, the equations of motion are reduced to nonlinear algebraic equations and ordinary differential equations (ODEs) for the bending and vibration problems respectively. By solving the algebraic equations, closed-form solutions for the nonlinear bending deflection of the microplate are derived. Closed-form solutions for the nonlinear vibration frequency are also obtained by applying He's variational method to the ODEs. Based on the obtained closed-form solutions, numerical examples are further presented to investigate the effects of the material length scale parameter to thickness ratio, the length to thickness ratio, the power law index and the elastic foundation on the nonlinear bending and free vibration responses of the microplate. © 2015 Elsevier Ltd.


Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yu P.Y.,University of California at Berkeley | Chen X.,University of Missouri - Kansas City | Mao S.S.,University of California at Berkeley | And 2 more authors.
Physical Review Letters | Year: 2013

A new form of TiO2 which is black in color has been shown to exhibit high efficiency for photocatalytic reactions under solar radiation [X. Chen, L. Liu, P. Y. Yu, and S. S. Mao, Science 331, 746 (2011)SCIEAS0036-8075]. However, the mechanism behind this disorder-engineering process is not fully understood. In this Letter, based on density functional theory, we describe the role of hydrogen in producing lattice disorder in the anatase nanocrystals. We clarify further that the highly localized nature of the midgap states results in spatial separation of photoexcited electrons and holes in black TiO 2, and that accounts for its high photocatalytic efficiency. © 2013 American Physical Society.


Zhao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao Z.,University of Chinese Academy of Sciences | Sun Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 6 more authors.
Journal of Materials Chemistry | Year: 2012

The controlled synthesis of anatase titanium dioxide (TiO 2) with both high surface area and high energy facets is technologically important for its application in photocatalysis, photoelectrochemical cells, and solar cells. Here we report a simple and fluorine free hydrothermal method to synthesize hierarchically nanostructured mesoporous anatase TiO 2 spheres (MATS), which were covered with {001} facets. Mild H 2SO 4 was used as both a phase-inducer for the formation of the anatase phase and a capping agent to promote oriented growth and formation of {001} facets. Detailed XRD and SEM studies suggested that formation of MATS follows a typical nucleation and growth process. The refining or reconstruction of TiO 2 crystal structure during growth resulted in a mesoporous crystalline framework that exhibits enhanced adsorption and photocatalytic degradation of rhodamine B in comparison with that of commercial Degussa P25 TiO 2. © 2012 The Royal Society of Chemistry.


Bai F.,Henan University | Bai F.,University of New Mexico | Sun Z.,University of New Mexico | Sun Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Journal of Materials Chemistry | Year: 2012

We report the synthesis of mesostructured conjugated nanowires and fabrication of their freestanding papers. The nanowires are formed through non-covalent self-assembly of conjugated diacetylene precursor 5,7-octadecadiynoic acid via hydrogen bonding and π-π stacking in a simple sol-gel process. Resultant nanowires exhibit lamellar mesostructure and can be dispersed uniformly in aqueous solutions. The nanowire papers are fabricated through filtration of nanowire solutions. The papers exhibit mechanical robustness allowing them to be freely folded and cut like regular printer papers, and show rapid sensitivity to different ions, solvents, and UV irradiation, as well as reversible blue ↔ red chromatic switching induced by UV irradiation and solvatochromic transition. This journal is © The Royal Society of Chemistry 2012.


Xia T.,University of Missouri - Kansas City | Wallenmeyer P.,University of Missouri - Kansas City | Anderson A.,University of Missouri - Kansas City | Murowchick J.,University of Missouri - Kansas City | And 2 more authors.
RSC Advances | Year: 2014

Following our previous findings on hydrogenated black TiO2nanoparticles, here, we would like to present our exciting findings on hydrogenated black ZnO nanoparticles, which have displayed long-wavelength absorption and excellent photocatalytic performance. This further demonstrates that hydrogenation is a powerful tool to enhance the optical and photocatalytic performance of nanomaterials. This journal is © the Partner Organisations 2014.


Zhang X.-Y.,Changchun University of Technology | Sun S.-H.,Changchun University of Technology | Sun X.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao Y.-R.,Changchun University of Technology | And 4 more authors.
Light: Science and Applications | Year: 2016

Commonly used energy storage devices include stacked layers of active materials on two-dimensional sheets, and the limited specific surface area restricts the further development of energy storage. Three-dimensional (3D) structures with high specific surface areas would improve device performance. Herein, we present a novel procedure to fabricate macroscopic, high-quality, nitrogen-doped, 3D graphene/nanoparticle aerogels. The procedure includes vacuum filtration, freeze-drying, and plasma treatment, which can be further expanded for large-scale production of nitrogen-doped, graphene-based aerogels. The behavior of the supercapacitor is investigated using a typical nitrogen-doped graphene/Fe3O4 nanoparticle 3D structure (NG/Fe3O4). Compared with 3D graphene/Fe3O4 structures prepared by the traditional hydrothermal method, the NG/Fe3O4 supercapacitor prepared by the present method has a 153% improvement in specific capacitance, and there is no obvious decrease in specific capacitance after 1000 cycles. The present work provides a new and facile method to produce large-scale, 3D, graphene-based materials with high specific capacitance for energy storage.


Bai F.,Henan University | Bai F.,University of New Mexico | Sun Z.,University of New Mexico | Sun Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 5 more authors.
Nano Letters | Year: 2011

Hollow metallic nanostructures exhibit important applications in catalysis, sensing, and phototherapy due to their increased surface areas, reduced densities, and unique optical and electronic features. Here we report a facile photocatalytic process to synthesize and tune hollow platinum (Pt) nanostructures. Through hierarchically structured templates, well-defined hollow Pt nanostructures are achieved. These nanostructures possess interconnected nanoporous framework as shell with high surface area for enhanced catalytic performance/mass transport for methanol oxidation. © 2011 American Chemical Society.


Sun X.-Q.,Beijing University of Chemical Technology | Meng Q.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Meng Q.-Y.,Beijing University of Chemical Technology
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2013

The Eu-doped ZnO (ZnO:Eu) nanorod arrays have been successfully synthesized on nanoporous silicon pillar array (NSPA) substrates by hydrothermal method. The effective energy transfer from ZnO host to the doping ions has been revealed. The ZnO:Eu nanorod arrays could enrich the emissions of ZnO nanostructure, moreover, the fabrication method is simple under mild reaction condition. The presence of trivalent europium ions in ZnO crystal lattice has been confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under the ultraviolet (UV) laser excitation, ZnO-related UV and near band energy blue-green emission and Eu3+-related red emission were observed, which were attributed to the emission of ZnO, the band edge transition, the intrinsic defects and the Eu3+ ions transition, respectively. Based on the energy band diagram, the photoluminescence (PL) mechanism has been discussed, as well as energy transfer occurs from ZnO host to Eu3+ ions through intrinsic defects states of ZnO in ZnO:Eu nanorods structure.


Lu Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li Y.,CAS Shanghai Institute of Applied Physics | Peng Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2012

Six-bar parallel mechanism is now widely applied in synchrotron radiation beamline, while the six-dimensional adjustment is difficult and inefficient for lack of theoretical direction. This paper introduces a special six-bar parallel mechanism. By means of coordinate transformations, the inverse kinematics of six-bar parallel mechanism is studied, and the precise equations for six bars lengths are obtained. Based on the inverse kinematics, forward kinematics of six-bar parallel mechanism is obtained with trust region method working for nonlinear optimization. The corresponding MATLAB program is also designed. The results show that trust region method is an effective way to solve forward kinematics, and the program is stable, reliable and rapid. This method has small errors with linear precision of 10 -12 mm and rotational precision of 10 -15 deg. Using differential snail adjustment, monochromator chambers attitude can reach a linear resolution of 5 μm and a rotational resolution of 3″, which entirely satisfies the practical requirements. © 2012 Elsevier B.V. All rights reserved.


Bai F.,Henan University | Bai F.,University of New Mexico | Sun Z.,University of New Mexico | Sun Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 7 more authors.
Nano Letters | Year: 2011

We report a simple confined self-assembly process to synthesize nanoporous one-dimensional photoactive nanostructures. Through surfactant-assisted cooperative interactions (e.g., π-π stacking, ligand coordination, and so forth) of the macrocyclic building block, zinc meso-tetra (4-pyridyl) porphyrin (ZnTPyP), self-assembled ZnTPyP nanowires and nanorods with controlled diameters and aspect ratios are prepared. Electron microscopy characterization in combination with X-ray diffraction and gas sorption experiments indicate that these materials exhibit stable single-crystalline and high surface area nanoporous frameworks with well-defined external morphology. Optical characterizations using UV-vis spectroscopy and fluorescence imaging and spectroscopy show enhanced collective optical properties over the individual chromophores (ZnTPyP), favorable for exciton formation and transport. © 2011 American Chemical Society.


Xin H.-W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guan Y.-J.,Changchun University of Technology | Chai F.-M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2012

The position precision and dynamic stability of optical elements for an off-axis Three-mirror Anastigmatic (TMA) space remote sensor are dependent on its main support structure, therefore, this paper researches the design scheme of the main support structure for the TMA space remote sensor. After analysis of the common forms of main support structure, a composing of truss support structure was determined, and its materials and connection technique were discussed. The analytical solution for the first order natural frequency of the structure with three struts was derived and the best one was selected. On the basis of a original design, the sensitivity analysis and parameter optimization were used to obtain a main support structure with 24 struts, then it was verified by the static reversal and a dynamic test. Test results show that the front rotation angle change of the main support structure is less than 10″ and the first order natural frequency is 55 Hz, when it flips from a vertical state to a horizontal state. Furthermore, the maximum stress of the main support structure is 135 MPa during dynamic tests, which meets the design requirements of all indexes.


Xie M.-J.,Changchun University of Technology | Li L.-T.,Changchun University of Technology | Wang Z.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Energy Procedia | Year: 2011

In order to shorten the north-seeking time on the basis of ensuring the north-seeking precision, according to working principle and project practice of strap-down north-seeking system, a kind of variable period sampling method is designed based on the traditional stationary sampling period. This method sets the different sampling period on a basis of the sampling difference of dynamically tuned gyro in each measurement position. While ensuring the northseeking precision in every measurement position, reduce the north-seeking time by shortening the sampling period; avoid the conflict of north-seeking time and north-seeking precision in the stationary period sampling. The experiment results show, this method efficaciously enhances the north-seeking efficiency, which is to reduce the north-seeking time from 4.5min to 3.5min on the base of ensuring the north-seeking precision(less than 30″). © 2011 Published by Elsevier B.V.


Ma Z.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Han Z.-T.,China University of Mining and Technology
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

Grinding temperature which is the most important factor of the grind-hardening technology affects the surface quality of the workpiece directly. In order to study the temperature distribution and the mechanism of the technology, the mathematical model of the grinding temperature field was established, and the FEA simulation was conducted by using ANSYS software, and the mechanism of grind-hardening was proved through the analysis of the distribution and changing of the grinding temperature field, and then the hardened depth was predicted with the simulation result. At last, the grinding experiment was carried out, and the prediction result was proved consistent with the analysis of the hardness distribution of the workpiece, which indicates that the simulation results are available and feasible to study grind-hardening by means of FEA simulation.


Sun Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sun Z.,University of New Mexico | Bai F.,Henan University | Bai F.,University of New Mexico | And 4 more authors.
Chemistry of Materials | Year: 2012

Monodisperse fluorescent organic/inorganic composite nanoparticles are synthesized through the spontaneous self-assembly of block copolymer polystyrene-block-poly(vinylpyridine) and rare-earth ions (europium, terbium, thulium, etc.). Depending on the rare-earth ions selected, tunable light-emission colors, including the primary red, green, and blue, are accomplished. Further, by stoichiometric mixing of the nanoparticles that emit different colors, the full color spectrum can be accessed. Both electron microscopy and spectroscopic characterizations confirm specific interactions of rare-earth and block copolymers. The resulting nanoparticles are monodisperse as characterized by dynamic light scattering. They are very stable and can be dispersed in common solvents, and together with homopolymers, they form ordered arrays and thin films (both supported and free-standing) upon solvent evaporation. The resulting nanoparticle thin films exhibit mechanical flexibility for ease of processing or device integration. © 2012 American Chemical Society.


Yang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yang Y.,Inner Mongolia University for Nationalities | Gao C.,Inner Mongolia University for Nationalities | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Sensors and Actuators, B: Chemical | Year: 2014

A bifunctional colorimetric and fluorescent chemosensor RbCS has been successfully designed and synthesized by simple condensation of 3,5-dichlorosalicylaldehyde and rhodamine B hydrazide. In aqueous media, chemosensor RbCS exhibits remarkably enhanced absorbance intensity and color change from colorless to pink for Cu2+, and shows significant "off-on" fluorescence accompanied with color changes from colorless to red upon binding to Hg2+. The absorbance and fluorescence signals of RbCS can be restored with addition of EDTA disodium into solutions of RbCS-Cu2+ and RbCS-Hg2+, showing that the binding of chemosensor RbCS and Cu2+/Hg2+ is chemically reversible. © 2014 Elsevier B.V.


Liu G.,University of Nebraska - Lincoln | Li K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Sensors and Actuators, B: Chemical | Year: 2015

The recognition of abrin is of great civil and military importance. As an alternative to general detecting techniques, such as enzyme-linked immunosorbent assay (ELISA) and electrochemiluminescence (ECL)-based assay, micro/nano optical fibers (MNFs) for the label-free detection of abrin have been investigated for the first time in this paper. The MNFs fabricated through chemical etching are robust and have excellent mechanical strength for practical applications. This MNF-based biosensors feature fast response, high sensitivity, and low cost. A limit of detection of 10 pg/mL was obtained using a MNF with a waist diameter of circa 1.0 μm, and the typical measurement time was less than 10 min. By taking advantage of the label-free detection, Langmuir kinetics fitting for the dynamic reaction curve suggested a large affinity constant between the antibody and abrin. Regeneration ability of the sensor was also demonstrated by the maintenance of high sensitivity and selectivity after releasing experiments. ©2015 Elsevier B.V. All rights reserved.


Zhao J.-W.,Luoyang Institute of Science and Technology | Kong X.-G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2011

NaYF4:Yb3+, Er3+ nanocrystals were successfully prepared by the combination of coprecipitation and hydrothermal methods using 2-aminoethyl phosphate (AEP) as chelator. It is found that the crystal structures of the NaYF4:Yb3+, Er3+ nanoparticles before and after hydrothermal treatment are both in cubic phase, the size of which is about 80 nm. The upconversion luminescence from the two samples was observed under the excitation of 980 nm laser. The green and red emission bands are attributed to the transition of 2H11/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 energy levels of Er3+ ions, respectively. The upconversion luminescence intensity of the sample with hydrothermal treatment is much stronger than that of the sample without hydrothermal treatment due to the improved crystallization of the samples and the reduction of organic ligands on the surface of the NaYF4:Yb3+, Er3+ nanoparticles.


Lu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lu W.,University of Chinese Academy of Sciences | Hao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Inorganic Chemistry | Year: 2011

A series of single-phase full-color emitting BaMg2Al 6Si9O30:Eu2+, Tb3+, Mn2+ phosphors has been synthesized by solid-state reaction. Energy transfer from Eu2+ to Tb3+ and Eu2+ to Mn 2+ in BaMg2Al6Si9O30 host matrix is studied by luminescence spectra and energy-transfer efficiency and lifetimes. The wavelength-tunable white light can be realized by coupling the emission bands centered at 450, 542, and 610 nm ascribed to the contribution from Eu2+ and Tb3+ and Mn2+, respectively. By properly tuning the relative composition of Tb3+/Mn2+, chromaticity coordinates of (0.31, 0.30), high color rendering index R a = 90, and correlated color temperature (CCT) = 5374 K can be achieved upon excitation of UV light. Thermal quenching properties reveal that BaMg2Al6Si9O30: Eu2+, Tb3+, Mn2+ exhibits excellent characteristics even better than that of YAG:Ce. Our results indicate our white BaMg2Al 6Si9O30:Eu2+, Tb3+, Mn2+ can serve as a key material for phosphor-converted light-emitting diode and fluorescent lamps. © 2011 American Chemical Society.


He F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.-X.,National Center for Space Weather | Chen B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fok M.-C.,NASA | Zou Y.-L.,CAS National Astronomical Observatories
Journal of Geophysical Research: Space Physics | Year: 2013

The EUV imager on board the Chang'E-3 lunar lander will image the Earth's plasmasphere from a lunar perspective to focus on some of the open questions in plasmaspheric researches (i.e., global structures, erosion, and refilling of plasmasphere). In order to achieve the understanding of the plasmaspheric dynamics in relation to these EUV images in lunar perspective, the He + 30.4 nm emission intensities and global structures of the plasmasphere viewed from the moon are investigated using a dynamic global core plasma model embedded with TS07 magnetic field model and W05 electric field model. Two typical storms observed by the IMAGE EUV imager are systematically simulated from the perspectives of the moon. It is found from the simulations that the maximum emission intensity of the plasmasphere is ~12.3 R which is greater than that detected from polar orbit, and the global shapes and temporal evolutions of large-scale plasmaspheric structures (plasmapause, shoulder, and plume) also have different patterns in moon-based simulated images. It is also shown that the plasmaspheric structures extracted from moon-based EUV images are in agreement with those from IMAGE EUV images. Systematic simulations demonstrate that specific latitudinal distribution of the plasmaspheric structures can only be imaged at specific positions in lunar orbit. It is expected that this investigation provides us with an overall understanding on moon-based EUV images and helps to identify the plasmaspheric structures and evolution patterns in future moon-based EUV imaging. Key Points First comprehensive simulation of the moon-based EUV imaging Plasmasphere exhibits new structure and evolution pattern in view of Moon Moon-based EUV imaging can solve the open questions in plasmaspheric research ©2013. American Geophysical Union. All Rights Reserved.


Wei X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Z.,CAS Institute of Electrical Engineering | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Renewable Energy | Year: 2010

A new method for the design of the heliostat field layout for solar tower power plant is proposed. In the new method, the heliostat boundary is constrained by the receiver geometrical aperture and the efficiency factor which is the product of the annual cosine efficiency and the annual atmospheric transmission efficiency of heliostat. With the new method, the annual interception efficiency does not need to be calculated when places the heliostats, therefore the total time of design and optimization is saved significantly. Based on the new method, a new code for heliostat field layout design (HFLD) has been developed and a new heliostat field layout for the PS10 plant at the PS10 location has been designed by using the new code. Compared with current PS10 layout, the new designed heliostats have the same optical efficiency but with a faster response speed. In addition, to evaluate the feasibility of crops growth on the field land under heliostats, a new calculation method for the annual sunshine duration on the land surface is proposed as well. © 2010 Elsevier Ltd. All rights reserved.


Li X.,University of Georgia | Budai J.D.,Oak Ridge National Laboratory | Liu F.,University of Georgia | Howe J.Y.,Oak Ridge National Laboratory | And 6 more authors.
Light: Science and Applications | Year: 2013

Phosphor-converted white light-emitting diodes for indoor illumination need to be warm-white (i.e., correlated color temperature,<4000 K) with good color rendition (i.e., color rendering index >.80). However, no single-phosphor, single-emitting-center-converted white light-emitting diodes can simultaneously satisfy the color temperature and rendition requirements due to the lack of sufficient red spectral component in the phosphors' emission spectrum. Here, we report a new yellow Ba0.93Eu0.07Al 2O4 phosphor that has a new orthorhombic lattice structure and exhibits a broad yellow photoluminescence band with sufficient red spectral component. Warm-white emissions with correlated color temperature <4000 K and color rendering index >80 were readily achieved when combining the Ba0.93Eu0.07Al2O4 phosphor with a blue light-emitting diode (440-470 nm). This study demonstrates that warm-white light-emitting diodes with high color rendition (i.e., color rendering index .80) can be achieved based on single-phosphor, single-emitting-center conversion. © 2013 CIOMP. All rights reserved.


Wei X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Z.,CAS Institute of Electrical Engineering
Renewable Energy | Year: 2011

The tracking and ray tracing equations for the target-aligned heliostat for solar tower power plants have been derived in this paper. Based on the equations, a new module for analysis of the target-aligned heliostat with an asymmetric surface has been developed and incorporated in the code HFLD. To validate the tracking and ray tracing equations, a target-aligned heliostat with a toroidal surface is designed and modeled. The image of the target-aligned heliostat is calculated by the modified code HFLD and compared with that calculated by the commercial software Zemax. It is shown that the calculated results coincide with each other very well. Therefore, the correctness of the tracking and ray tracing equations for the target-aligned heliostat is proved. © 2011 Elsevier Ltd.


Hao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang X.,Georgia Southern University
Optical Materials | Year: 2011

We report an intense full-color emission originating from 5D0,1,2,3 to 7F0,1,2,3,4 transitions of Eu3+ in CaSc2O4 upon 395 nm excitation. The emission spectra vary with increasing Eu3+ concentration, demonstrating tunable color coordinates from white to red region in the CIE chromaticity diagram. Considering the relaxation from 5DJ to 5DJ-1 through cross energy transfer, the Eu3+ concentration dependent emission spectra are well simulated based on the analysis of steady state rate equations and the measured lifetimes of the 5DJ levels. It is suggested that CaSc 2O4:Eu3+ could be a potential single-phased full-color emitting phosphor for near-ultraviolet InGaN chip pumped white light emitting diodes. © 2010 Elsevier B.V. All rights reserved.


Wei X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Z.,CAS Institute of Electrical Engineering
Solar Energy | Year: 2010

A new code for the design and analysis of the heliostat field layout for power tower system is developed. In the new code, a new method for the heliostat field layout is proposed based on the edge ray principle of nonimaging optics. The heliostat field boundary is constrained by the tower height, the receiver tilt angle and size and the heliostat efficiency factor which is the product of the annual cosine efficiency and the annual atmospheric transmission efficiency. With the new method, the heliostat can be placed with a higher efficiency and a faster response speed of the design and optimization can be obtained. A new module for the analysis of the aspherical heliostat is created in the new code. A new toroidal heliostat field is designed and analyzed by using the new code. Compared with the spherical heliostat, the solar image radius of the field is reduced by about 30% by using the toroidal heliostat if the mirror shape and the tracking are ideal. In addition, to maximize the utilization of land, suitable crops can be considered to be planted under heliostats. To evaluate the feasibility of the crop growth, a method for calculating the annual distribution of sunshine duration on the land surface is developed as well. © 2010 Elsevier Ltd. All rights reserved.


Chen H.,Fudan University | Liu K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Hu L.,Fudan University | Al-Ghamdi A.A.,King Abdulaziz University | Fang X.,Fudan University
Materials Today | Year: 2015

Benefitting from the continuous innovations in semiconductor materials and device fabricating techniques, ultraviolet (UV) photodetectors have been successfully used in advanced communications, flame detection, air purification, ozone sensing and leak detection, among others, in the past few decades. Nowadays, nanoscience, nanofabrication technologies and versatile materials have sparked a new vision of UV photodetectors, which move toward higher precision, lower energy consumption and greater miniaturization. This paper is thus mainly focused on the perspective of molding devices through exploring new materials and novel architectures inspired by state-of-the-art UV photodetectors, predicting the direction of next-generation photodetectors. It is expected that new concept UV photodetectors with smart, intelligent and multifunctional design will benefit daily life and the well-being of society in the near future. © 2015 The Authors.


Liu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu Y.,University of Chinese Academy of Sciences | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Hao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Chemical Communications | Year: 2011

A tunable full-color-emitting Ca3Sc2Si 3O12:Ce3+, Mn2+ (CSS:Ce 3+,Mn2+) phosphor is obtained by addition of doped ions as charge compensation. White LEDs with high Ra (> 90) are achieved using the single CSS:Ce3+,Mn2+ phosphor. © 2011 The Royal Society of Chemistry.


Liu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu Y.,University of Chinese Academy of Sciences | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Hao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Journal of Materials Chemistry | Year: 2011

We report luminescence properties of Ce3+ and Mn2+ co-activated Ca3Sc2Si3O12 (CSS) silicate garnets. It is observed that Mn2+ may not only occupy Ca2+ sites to generate a yellow emission (Mn2+(I)) at 574 nm but also Sc3+ sites to generate a red emission (Mn 2+(II)) at 680 nm. Considerable Mn2+ substitution for Sc3+ can be performed through balancing their charge difference by introducing a trivalent rare earth ion, such as La3+ and Ce 3+, to replace Ca2+. Meanwhile, remarkable energy transfer from the green emitting Ce3+ to both Mn2+(I) and Mn 2+(II) can occur, making tunable color and white light emission available in CSS:Ce3+,Mn2+ upon blue excitation into Ce3+. White LEDs combined by CSS:Ce3+,Mn2+ phosphors and blue LED chips are fabricated. A CSS:0.03Ce3+,0. 2Mn2+ phosphor with deficient red emission is enriched in red by increasing Ce3+ concentration to 0.1, which leads to increase of Mn2+(II) number in case of charge compensation by more Ce 3+ ions. Consequently, the color rendering index of the white LEDs is improved from 64 to 76. The results of this work indicate that CSS:Ce 3+,Mn2+ garnet could be a promising single phase phosphor for white LEDs. © 2011 The Royal Society of Chemistry.


Liu L.,Changchun University of Science and Technology | Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

To improve the adaptive capacity of a space camera to environment temperatures and to enhance its imaging quality, this paper explores how to implement the thermal control by relaxing thermal control indictors. A mathematical formula of intercept and defocus affected by temperatures is derived for a pure off-axis Three Mirror Anastigmatism(TMA) optical system. The analysis shows that camera defocus amount and temperature are a linear relationship. Then, a constant K value is calculated. Furthermore, it indicates when reflector and camera structures have the same coefficient of linear expansion, the defocus does not occur. However, the greater the difference between two material linear expansion coefficients is, the greater the amount of defocus is. With defocusing formula, it suggests that mechanical focusing methods must be used to request for compensation when the camera temperature level changes more than ± 1°C(corresponding to the defocus amount of 0.05 mm). Using integrated photo-thermal simulation method , the temperature range Δt is obtained to ensure the image quality of the camera. Finally, camera's focus range is derived by using the formula of defocus. The result of defocus test under thermal vacuum environment verifies the correctness of the defocus formula and the defocus amount of ± 0.184 mm is a proper focus range corresponding camera temperature levels changed in ± 4°C.


Guo H.-Z.,Changchun University of Science and Technology | Lu H.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qu L.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

The error of line transfer frequency from Time Delay Integration (TDI) CCD has strong influence on dynamic Modulation Transform Function (MTF) and it is stronger when the integral grade is higher. Therefore, this paper develops an accurate mathematical model for dynamic MTF and line transfer period error rate was developed. Firstly, a typical line transfer timing of TDICCD was introduced and the window functions of one integral grade and multiple integral grade were derived. On these bases, the relationship between line transfer period error rate and dynamic MTF for this timing was established by Fourier transform of the window functions and a nonlinear parameter was derived in the function which is none in the traditional one. Then, simulations and experiments were performed, which indicate that when ΔT/T=0, the dynamic MTF value for this timing is 0.632 5 times of static MTF with the number of phases b=4. It also indicates that there are obvious differences between dynamic MTF curves from proposed method and traditional method. Finally according to the requirement of the index, the maximum line transfer period error rates with different integral grades are given, which ensures that the decline of the dynamic MTF is less than 5%.


Fang F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fang F.,Changchun University of Science and Technology | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Physical Chemistry Chemical Physics | Year: 2010

Through a facile low-temperature solution process, vertically n-type ZnO nanorod arrays were grown on a GaN film to form a n-ZnO nanorod/p-GaN film heterojunction. A study of the electroluminescence (EL) characteristics of the heterojunction in air and in air with 2000 ppm hydrogen revealed the sensitivity of such a device to the surrounding atmosphere. The additional hydrogen shallow donors increased the effective electron concentration in ZnO nanorods and the EL recombination zone changed from the ZnO nanorods to the GaN film, which can be identified visually from the color change. © the Owner Societies.


Lu Y.,Changchun University of Science and Technology | Zhao L.,Changchun University of Science and Technology | Zhai P.,Changchun University of Science and Technology | Xia J.,Changchun University of Science and Technology | And 2 more authors.
Optics Letters | Year: 2012

We present a diode-pumped quasi-three-level neodymium-doped yttrium aluminum garnet (Nd:YAG) laser at 885 nm, based on the4F 3/2-4I9/2 transition, generally used for a 946 nm emission. Combined with polarization components (Nd:YAG), the electro-optical crystal KH2PO4 (KDP) formed a Lyot filter in the cavity and compressed the available gain bandwidth. With an incident pump power of 9.2 W, a 714 mW continuous-wave (CW) output at 885 nm was achieved, and the optical-to-optical efficiency was 7.8%. With an adjustable voltage applied to the KDP crystal, the laser wavelength couldbe tuned from 885 nm to 884 nm. A simultaneous dual-wavelength Nd:YAG laser at 885 nm and 884 nm was also realized by adjusting the free spectral range of the Lyot filter. To our knowledge, it is the first study that has realized the tuning between the 884 and 885 nm lines and the simultaneous dual-wavelength CW laser operation at 885 nm and 884 nm. © 2012 Optical Society of America.


Zhi S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhi S.,University of Chinese Academy of Sciences | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li X.-L.,Changchun University of Science and Technology
Chinese Optics | Year: 2014

In this paper, through calculation of the attitude parameters of star tracker, the observed star extraction and star map simulation were realized. The image point was taken gray diffusion according to the 2D Gaussian distribution model. Considering the influences of noise, the real sky star map taken by star tracker on orbit was simulated in real time. Experiments show that the star map obtained through simulation of the real one taken by satellite on orbit could provide confirmation for algorithm of star point extraction, star map recognition and attitude solution of the star sensor.


Lu Y.,Changchun University of Science and Technology | Zhai P.,Changchun University of Science and Technology | Xia J.,Changchun University of Science and Technology | Fu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li S.,Changchun University of Science and Technology
Journal of the Optical Society of America B: Optical Physics | Year: 2012

A dual-wavelength continuous-wave (cw) diode-end-pumped Nd:YAlO3 (Nd:YAP) laser that generates simultaneous laser at the wavelengths 1079.5 nm and 1064.5 nm is demonstrated. The optimum oscillation condition for the simultaneous orthogonal polarized dual-wavelength operation has been derived. A polarization beam splitter was placed in the cavity to split the beams polarizing in two orthogonal directions. We obtained a total power output over 6.5 W in two orthogonal polarized beam directions with 4.64 W in c-axis polarization and 1.86 W in a-axis polarization. Intracavity sum-frequency mixing at 1079.5 and 1064.5 nm was then realized in a KTiOPO4 (KTP) crystal to reach the green range. We obtained a cw output power of 1.12 W at 536 nm at the incident pump power of 17.3 W. © 2012 Optical Society of America.


Ji W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jing P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu W.,University of Chinese Academy of Sciences | And 5 more authors.
Applied Physics Letters | Year: 2013

Deep-blue, high color purity electroluminescence (EL) is demonstrated in an inverted light-emitting device using nontoxic ZnSe/ZnS core/shell quantum dots (QDs) as the emitter. The device exhibits moderate turn-on voltage (4.0 V) and color-saturated deep blue emission with a narrow full width at half maximum of ∼15 nm and emission peak at 441 nm. Their maximum luminance and current efficiency reach 1170 cd/m2 and 0.51 cd/A, respectively. The high performances are achieved through a ZnO nanoparticle based electron-transporting layer due to efficient electron injection into the ZnSe/ZnS QDs. Energy transfer processes between the ZnSe/ZnS QDs and hole-transporting materials are studied by time-resolved photoluminescence spectroscopy to understand the EL mechanism of the devices. These results provide a new guide for the fabrication of efficient deep-blue quantum dot light-emitting diodes and the realization of QD-based lighting sources and full-color panel displays. © 2013 AIP Publishing LLC.


Huang W.,Soochow University of China | Chen L.,Soochow University of China | Xuan L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
RSC Advances | Year: 2014

Performances of organic distributed feedback (DFB) lasers made from holographic polymer dispersed liquid crystal (HPDLC) transmission gratings were greatly improved by replacing common laser dye with organic semiconductor poly(2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylenevinylene) (MEH-PPV) as the gain medium. The MEH-PPV layer was laminated between the glass substrate and the HPDLC grating layer. Light interaction for feedback is provided by an evanescent wave spread into the grating layer. The device showed single-mode, TE polarized laser emission with a threshold of only 0.17 μJ per pulse (17 μJ cm-2). Slope efficiencies as high as 4.7% and 6.5% were measured for optical pumping of the device with P polarization and S polarization, respectively. Lasing was also coupled by the grating out of the waveguide and into free space. Furthermore, the output laser wavelength was systematically tuned over a range of 43 nm by varying the grating period. The laser thresholds at different wavelengths trace well with the amplified spontaneous emission spectrum of the MEH-PPV film. In terms of the HPDLC technique, our results show there is still plenty of potential to be exploited for fabricating organic DFB lasers. © the Partner Organisations 2014.


Wang X.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang X.-K.,Changchun University of Science and Technology
Chinese Optics | Year: 2015

In order to meet the requirement of the engineering application about the real-time image processing, according to the one billion pixel transient cloud imaging system which has been designed based on the combined structure of a concentric spherical lens and micro camera mosaic array, an adaptive image mosaic algorithm of parallel acceleration based on the compute unified device architecture(CUDA) and prior information has been proposed. First, the imaging overlap region of the adjacent micro camera has been calibrated with high-precision four-axe calibration table, and the speed-up robust features(SURF) method has been used to extract the candidate feature points of the overlap region. Then, the approximate nearest neighbor(ANN) search algorithm based on random K-D tree which has been accelerated by the CUDA basic linear algebra subroutines(CUBLAS) is used to obtain the initial matching points. Finally, the improved parallel progressive sample consensus(IPROSAC) algorithm is used to eliminate the false matching points and estimate the parameters of the space transformation matrix, and the spatial geometry transformation relationship has been obtained about mosaic images. Experimental results indicate that the image mosaic time is 287 ms and the speed is improved about 30 times compared with serial algorithm using CPU. © 2015, Editorial Office of Chinese Optics. All right reserved.


Pang C.-Y.,Changchun University of Science and Technology | Ji X.-Q.,Changchun University of Science and Technology | Sun L.-N.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lang X.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangzi Xuebao/Acta Photonica Sinica | Year: 2013

In order to improve degraded image clarity and color fidelity in foggy weather, an improved defogging method based on dark-channel prior is proposed. According to the more computation time, and on the premise of defogging effect, fast bilateral filtering is used instead of soft matting to refine transmission map that reduces the complexity of the algorithm greatly. The processing time is 5% of original method, which can meet the real-time requirements of the general engineering. Since the brightness of image after haze removal is lower than the actual scene and the color is dim, a simple and effective method of image contrast and brightness enhancement is proposed. It adaptively enhances the image brightness, and modifies the local contrast which is due to the thick fog and haze. The experimental results indicates that this method can restore the fog scene and color rapidly and effectively, and guaranteed the stability and reliability of outdoor imaging system in bad weather in a certain extent.


Fang F.,Changchun University of Science and Technology | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Journal of Physical Chemistry C | Year: 2010

The coupling of piezoelectric and semiconducting properties in zinc oxide created a strain field and charge separation across the nanowire as a result of its bending. Such built-in fields open an additional channel of electron-phonon coupling that enhanced the longitudinal optical phonons scattering significantly. © 2010 American Chemical Society.


Yang C.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang J.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao L.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao L.-H.,Changchun University of Science and Technology
Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves | Year: 2011

Infrared radiation measurement is one of the important ways for target signature acquirement and target recognition, wherein atmospheric correction is a requisite step for obtaining the real radiation of the target. In the conventional radiation measurement method, it is necessary to measure atmosphere parameters by using atmosphere observation devices, and calculate the atmospheric transmittance and the air path radiance from these parameters by using a atmospheric radiation transport calculation software. The uncertainty in the atmospheric transmittance obtained by the conventional method is about 10~20%, and the target radiation inversion precision is about 12~23%. To improve the radiation inversion precision, a novel radiation measurement method based on real-time correction was presented, which measured the atmospheric transmittance with high precision by using a reference blackbody near the target. Models for atmospheric transmittance calculation and target radiation inversion were proposed. Analysis showed that the uncertainty in the atmospheric transmittance obtained by the novel method is about 6~10.5%, and the radiation inversion precision obtained by the novel method is better than 3.5%. A radiation measurement was performed by using a MW infrared camera. Theresults showed that the radiation inversion precision of the conventional method is 7.5~24.7%, while that of the novel method is 0.1~3.4%. The novel method has an important significance for improving the target radiation inversion precision.


Yang C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao L.,Changchun University of Science and Technology
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2011

To perform radiation calibration on infrared opto-electric system with a large-aperture, a radiation calibration system based on extended area blackbody and a spectral calibration system based on infrared monochroic collimator were established. The infrared monochroic collimator was composed of a cavity blackbody, a circular variable filter (CVF) and a collimator. It was used to calibrate the infrared opto-electric system spectrally in order to determine its normalized relative spectral response function. A large extended area blackbody, which covered the input pupil and the view field of the infrared opto-electric system, was used to perform radiation calibration on the infrared system in order to determine its absolute radiance responsivity. Analysis on error sources of the radiance responsivity was performed, and the uncertainty of the responsivity came from uncertainties for the output value of the infrared opto-electric system, radiation emitting from the extended area blackbody, the spectral calibration and the background radiation, which were 0.4%, 4.9%, 2.5%, 1.9% respectively after measuring and calculating. The calculation results show that the uncertainty of the radiance responsivity is 6.1% which is smaller than the uncertainty requirement of 10% for the infrared opto-electric system.


Yang C.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang J.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao L.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao L.-H.,Changchun University of Science and Technology
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2012

Atmospheric transmittance is an important factor affecting the radiation measurement precision. Generally, the error of conventional atmospheric transmittance calculated from atmosphere parameters by using a atmosphere model calculation software such as MODTRAN is above 15%, which limits the target radiation measurement precision greatly. Therefore, a new radiation measurement method was proposed, by which the ratio between the really-measured atmospheric transmittance and the calculated one for a distance was taken to obtain an atmospheric transmittance correction coefficient. Then, the correction coefficient was used to correct atmospheric transmittances of other measurement distances. Experiments show that the precision of the corrected atmospheric transmittance is better than 8.1%, which improves the target radiation measurement precision greatly. A radiation measurement experiment was performed by using a midwave infrared camera and a blackbody, and the results show that the radiation inversion precision obtained by the conventional method is about 20% and the precision obtained by the proposed method using the corrected atmospheric transmittance has been better than 10%.


Liu L.,Changchun University of Science and Technology | Liu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao G.-H.,Changchun University of Science and Technology
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2012

A focusing mechanism with a tilt of focusing plane assembly less than 7″, positioning accuracy better than 0.01 mm in the ±2 mm focusing range was designed to ensure the best image quality for a wide field space camera with a focal plane length more than 600 mm. To meet the requirements of the focusing mechanism for focusing accuracy, mechanical environments and the vacuum environments, the dual-cam drive technology was used to complete the accurate focusing, and the loss of power brake self-locking technology allowed the camera to be a stable image plane position under the impact of mechanical environments. Furthermore, the high stiffness rail and bearings were used in the focusing mechanism to obtain a high dynamic stiffness. The design analysis and experimental results show that the dual focal plane cam-driven focusing mechanism has high focusing precision and high reliability and is able to complete the focuing and improve the image quality of space cameras in the complex space environments.


Yang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jiang L.,Changchun University of Science and Technology | Jin G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2012

The imaging matching model of the digital domain time-delay integral (TDI) complementary metal-oxide-semiconductor (CMOS) sensor under the staring gesture is designed in order to realize high-resolution staring imaging, attitude which satellite changes relative to orbital coordinate system staring on satellite staring tracing imaging is derived. The coordinate transformation method is used to real-time compute the time of the line transfer process in the staring, the method of Monte Carlo is used to statistically calculate the influence of imaging under the satellite's attitude point precision and stability in the mode of staring imaging. The TDI CMOS prototype and the minitype three-axis air bearing table constructed for attitude control are used to simulate the digital domain TDI CMOS staring imaging. Experimental results show that the satellite's attitude control accuracy will cause the vertical image velocity mismatch and the residual image of transverse matching in the process of imaging. The higher imaging integral series is, the greater the signal-to-noise ratio (SNR) of the image will be. Integral series increase has a higher requirements to the satellite attitude. The control accuracy of the attitude angles and attitude angular velocity of the staring imaging simulation platform is better than 0.05° and 0.005°/s, the integral series 48 can meet the image-quality requirement.


Zhu H.,Hong Kong Polytechnic University | Yu S.F.,Hong Kong Polytechnic University | Wang Q.J.,Nanyang Technological University | Shan C.X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Su S.C.,South China Normal University
Optics Letters | Year: 2013

Ring microcavities were formed by wrapping ZnS microbelts, which act as the waveguide and gain region of the microcavities on the surface of optical fibers. The ring microcavities with the formation of whispering gallery modes have lasing threshold lower (Q-factor higher) than that of the ZnS microbelts. The excitation of TM modes could also be suppressed by the ring geometries of ZnS microbelts. Furthermore, directional single-mode lasing was realized from a coupled asymmetric ring microcavity. The Vernier coupling effect and deformed geometry of the asymmetric ring microcavity were contributed to the stable single-mode operation and directional emission, respectively. © 2013 Optical Society of America.


Xiao X.,Northeast Normal University | Shao K.,Northeast Normal University | Yan L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Mei Z.,Baicheng Normal College | And 2 more authors.
Dalton Transactions | Year: 2013

A novel macrocyclic organotin(iv) carboxylate {[n-Bu2Sn(O)] 9(CH2CH3)2L}·3CH 2CH3OH (complex 1) (L = (9-carboxymethyl-1,3,8,10- tetraoxo-3,8,9,10-tetrahydro-1H-anthra[2,1,9-def;6,5,10- d′e′f′]diisoquinolin-2-yl)-acetic acid) was generated by the reaction of dibutyltin oxide with amide dicarboxylic acid L and characterized by elemental analysis, IR, 1H and 13C NMR spectroscopy. X-ray crystallography diffraction analysis reveals that 1 is a centrosymmetric macrocycle and contains a nona-nuclear eight-fold-ladder-like organo-oxotin cluster. The preliminary luminescent properties of complex 1 have also been studied. © 2013 The Royal Society of Chemistry.


Liu D.,Northeast Normal University | Lu Y.,Northeast Normal University | Tan H.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang T.-T.,Northeast Normal University | Wang E.-B.,Northeast Normal University
Crystal Growth and Design | Year: 2015

A family of polyoxometalate compounds based on 1:13 polyoxoanions [MnV13O38]7-, organic molecules, and lanthanide cations, H[{La2(DMF)5(H2O)4}{MnV13O38}]·DMF·5H2O (1), H[{Ce2(DMF)2(H2O)7}{MnV13O38}]·0.5DMF·5.5H2O (2), H2[{K(H2O)2}2{Nd(DMF)(H2O)3}{MnV13O38}]·5H2O (3), H[{Ln2(C6H5NO2)3(H2O)6}{[MnV13O38}]·C6H5NO2·10H2O (Ln = La 4, Ce 5), and H2.5[{Pr(C6H5NO2)(H2O)3.5}{Pr0.5(H2O)2}{MnV13O38}]·0.5C6H5NO2·10H2O (6) (DMF = N,N-dimethylformamide; C6H5NO2 = isonicotinic acid), have been obtained utilizing a conventional method of aqueous solution and further characterized by elemental analysis, IR spectrum, UV spectrum, thermogravimetric analysis, and single-crystal X-ray diffraction. Compounds 1 and 2 exhibit a one-dimensional extended chain structure constructed by [MnV13O38]7- and lanthanide-organic coordination linkage, while compound 3 reveals three-dimensional (3D) open framework formed by polyoxoanion-lanthanide chains and potassium cations. Compounds 4-6 exhibit 3D supramolecular framework architectures based on [MnV13O38]7- polyoxoanions and lanthanide-organic coordination units. These compounds represent the first examples of extended organic-inorganic hybrids built up by [MnV13O38]7- building blocks and rare earth cations. The influences of the lanthanide contraction effect on the structural alterations from 1 to 3 and from 4 to 6 have been disscussed. The electrochemical and electrocatalytic properties for compounds 1-6 have been studied. Magnetic studies indicate that antiferromagnetic interactions exist in compounds 1-6. © 2014 American Chemical Society.


Tian S.-C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Tong C.-Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang C.-L.,Northeast Normal University | Ning Y.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Luminescence | Year: 2014

The resonance fluorescence spectrum from a triple quantum dot molecules controlled by tunneling is investigated. The positions, widths and heights of the resonance fluorescence peaks can be modified by the tunneling between the dots rather than the laser field, and interesting features such as controllable triple narrow peaks are obtained. The spectrum is explained with the transition properties of the dressed states generated by the coupling of the tunneling and the laser field. These features can also be viewed as the effects of spontaneously generated coherence between the close-lying states in the dressed state picture of the tunneling couplings, which can permit the observation of spontaneously generated coherence in quantum dot molecules. © 2014 Published by Elsevier B.V.


Lu N.,Northeast Normal University | Zhao Y.,Northeast Normal University | Liu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guo Y.,Northeast Normal University | And 4 more authors.
Journal of Hazardous Materials | Year: 2012

A series of polyoxometallate/titania (H 3PW 12O 40/TiO 2) composite films with different H 3PW 12O 40 loadings (6.3%, 7.7%, 14.7% and 16.7%) were prepared by a modified sol-gel-hydrothermal route followed by a spin-coating method. The smooth films are constructed by the well-distributed H 3PW 12O 40/TiO 2 sphere with particle size in the range from 80 to 100nm, and the bandgap of the composite films is somewhat narrower compared with as-prepared pure TiO 2 film. As a novel photocatalytic material, the photocatalytic performances of the H 3PW 12O 40/TiO 2 composite films were evaluated by the degradation and mineralization of an aqueous dye Rhodamine B (RB) under solar simulating Xe lamp irradiation (320nm<λ<780nm), and the enhanced photocatalytic activity in comparison to pure TiO 2 film as well as the H 3PW 12O 40/TiO 2 and Degussa P25 TiO 2 powder was obtained. Additionally, the composite films can be reused at least for three times without losing their catalytic activity. © 2011 Elsevier B.V.


Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,University of Chinese Academy of Sciences | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Su Z.,Northeast Normal University | Yue S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Sensors and Actuators, B: Chemical | Year: 2010

In this paper, we report the synthesis, characterization, and Fe(III)-sensing properties of two easily synthesized rare-earth(III)-based emitters, Na3Eu(PDA)3 and Na3Tb(PDA)3. Results suggest that the two emitters exhibit high sensitivity and linear spectral response towards Fe(III) (Stern-Volmer constant = 2.21 × 104 L/mol, linearity = 0.988). In addition, the two emitters are oxygen- and temperature-insensitive, making themselves promising candidates to be utilized in actual applications. © 2009 Elsevier B.V. All rights reserved.


Guo Y.,Northeast Normal University | Guo W.,Northeast Normal University | Yang Y.,Northeast Normal University | Jia Y.,Northeast Normal University | Liu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Physical Chemistry Chemical Physics | Year: 2014

A series of hierarchical Bi12TiO20-graphene nanoarchitectures (Bi12TiO20-GR) with GR loadings from 1% to 10% are fabricated by a single-step solvothermal treatment technique, and the intimate interfacial contact between flexible GR sheets and flower-like Bi 12TiO20 nanocrystals is observed in the Bi 12TiO20-GR composites. As a novel composite photocatalyst, Bi12TiO20-GR with GR loading of 2% possesses the highest simulated sunlight photocatalytic activity towards the degradation of two typical organic pollutants, methyl orange (MO) and p-nitrophenol (PNP). Furthermore, the separation and transportation of the photogenerated carriers in the simulated sunlight-irradiating Bi12TiO20-GR system is studied, meanwhile, the active species (hVB +, O 2 - and OH) generated in the Bi12TiO 20-GR-photocatalyzed PNP degradation system are identified by free radical and hole scavenging experiments. Based on the experimental and theoretical results, the mechanism and pathway of photocatalytic degradation of PNP in the simulated sunlight-irradiating Bi12TiO20-GR system are proposed. © 2014 the Owner Societies.


Wang R.,State Key Laboratory of Laser Interaction with Materials | Wang R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2015

The experiment system to analyze the image SNR with different gate width was used in this paper for confirming the range gating imaging SNR with different laser range measuring accuracy. First of all, the system parameters were determined according to the coverage model of the laser range gating imaging. On the basis of that, the experiment system was established and the outdoor experiment research was made with this system. The comparison analyzing of different gate width image also was made, and the curve of the relation between gate width and image SNR was obtained. The final experiment result indicates that the image SNR≥8 with gate width ≤2 μs can satisfy the requirement of auto recognition, which indicates that the range gating imaging system has no very strict requirement to the range measuring accuracy, and can satisfy the practical application requirement. © 2015, China Science Publishing & Media LTD. All right reserved.


Liu D.,Northeast Normal University | Lu Y.,Northeast Normal University | Tan H.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen W.-L.,Northeast Normal University | And 3 more authors.
Chemical Communications | Year: 2013

Purely inorganic porous frameworks using catalytically active [MnV 13O38]7- clusters as nodes and rare earth ions as linkers have been successfully prepared. The POM-based porous framework is a kind of multifunctional material, which exhibits selective adsorption behavior and remarkable catalytic activity for the heterogeneous oxidation of sulfides. This journal is © The Royal Society of Chemistry 2013.


Wang G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang G.,University of Chinese Academy of Sciences | Guo L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Duan H.,Northeast Normal University
The Scientific World Journal | Year: 2013

Target threat assessment is a key issue in the collaborative attack. To improve the accuracy and usefulness of target threat assessment in the aerial combat, we propose a variant of wavelet neural networks, MWFWNN network, to solve threat assessment. How to select the appropriate wavelet function is difficult when constructing wavelet neural network. This paper proposes a wavelet mother function selection algorithm with minimum mean squared error and then constructs MWFWNN network using the above algorithm. Firstly, it needs to establish wavelet function library; secondly, wavelet neural network is constructed with each wavelet mother function in the library and wavelet function parameters and the network weights are updated according to the relevant modifying formula. The constructed wavelet neural network is detected with training set, and then optimal wavelet function with minimum mean squared error is chosen to build MWFWNN network. Experimental results show that the mean squared error is 1. 23 × 10 - 3, which is better than WNN, BP, and PSO-SVM. Target threat assessment model based on the MWFWNN has a good predictive ability, so it can quickly and accurately complete target threat assessment. © 2013 Gaige Wang et al.


Wang N.,Hong Kong Polytechnic University | Zhang X.,Hong Kong Polytechnic University | Wang Y.,Hong Kong Polytechnic University | Yu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chan H.L.W.,Hong Kong Polytechnic University
Lab on a Chip - Miniaturisation for Chemistry and Biology | Year: 2014

Photocatalytic water purification utilizes light to degrade the contaminants in water and may enjoy many merits of microfluidics technology such as fine flow control, large surface-area-to-volume ratio and self-refreshing of reaction surface. Although a number of microfluidic reactors have been reported for photocatalysis, there is still a lack of a comprehensive review. This article aims to identify the physical mechanisms that underpin the synergy of microfluidics and photocatalysis, and, based on which, to review the reported microfluidic photocatalytic reactors. These microreactors help overcome different problems in bulk reactors such as photon transfer limitation, mass transfer limitation, oxygen deficiency, and lack of reaction pathway control. They may be scaled up for large-throughput industrial applications of water processing and may also find niche applications in rapid screening and standardized tests of photocatalysts. © 2014 The Royal Society of Chemistry.


Xie X.,Northeast Normal University | Chen X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.,Northeast Normal University | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Dyes and Pigments | Year: 2013

A highly-selective colorimetric chemosensor (CS1) for Cu2+ detection is prepared and characterized. This Cu2+ sensor can act as a potential probe towards ClO-, by taking advantage of the oxidation property of hypochlorite and different coordinating property of Cu+ and Cu2+ with CS1. Upon addition of ClO-, the absorption maximum band of CS1 in the presence of Cu+ in CH3CN/H 2O (4:1, v/v) shows a large red shift from 398 to 552 nm (Δ = 154 nm), and a visually color change from orange to purple is very easy to observe by naked-eyes, while other commonly-coexisting anions can not induce such similar changes. CS1 mimic an AND logic gate function with Cu+ and ClO- as inputs and A552 nm/A398 nm as output (A = absorbance), and this function can be easily reset by S 2-. © 2013 Elsevier Ltd. All rights reserved.


Wang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Y.,University of Chinese Academy of Sciences | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.,Northeast Normal University | And 2 more authors.
Langmuir | Year: 2013

In this paper, the fabrication, characterization, and application in oxygen sensing are reported for a novel multifunctional nanomaterial of [Ru(bpy) 2phen-MMS] (bpy, 2,2′-bipyridyl; phen, phenathrolin) which was simply prepared by covalently grafting the ruthenium(II) polypyridyl compounds into the channels of magnetic mesoporous silica nanocomposites (MMS). Scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, N2 adsorption-desorption, a superconducting quantum interference device, UV-vis spectroscopy, and photoluminescence spectra were used to characterize the samples. The well-designed multifunctional nanocomposites show superparamagnetic behavior and ordered mesoporous characteristics and exhibit a strong red-orange metal-to-ligand charge transfer emission. In addition, the obtained nanocomposites give high performance in oxygen sensing with high sensitivity (I0/I100 = 5.2), good Stern-Volmer characteristics (R 2 = 0.9995), and short response/recovery times (t↓ = 6 s and t↑ = 12 s). The magnetic, mesoporous, luminescent, and oxygen-sensing properties of this multifunctional nanostructure make it hold great promise as a novel multifunctional oxygen-sensing system for chemical/biosensor. © 2013 American Chemical Society.


Jia Y.,Northeast Normal University | Tan H.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Z.-M.,Northeast Normal University | Wang E.-B.,Northeast Normal University
Journal of Materials Chemistry C | Year: 2013

By ion metathesis reactions, the dimethyldioctadecylammonium (DODA +) was used as the surfactant to encapsulate organic-inorganic hybrid polyoxometalates (POMs) (NH4)6{Mo2 VO4[(Mo2 VIO6)NH 3CH2CH2CH2C(O)(PO3) 2]2}·10H2O (POM-1) and (NH 4)8{Mo2 VO4[(Mo 2 VIO6)CH3C(O)(PO3) 2]2}·14H2O (POM-2), resulting in two surfactant-encapsulated clusters (SECs) with characteristic thermotropic liquid-crystalline behavior. The chemical composition of the obtained SECs was determined by IR spectra, elemental analysis, TG analysis and NMR spectra. Also, polarized optical microscopy, differential scanning calorimetry (DSC), variable temperature X-ray diffraction (VT-XRD) and TEM of the samples were also performed, which revealed that both SECs show thermotropic liquid crystal behavior. © 2013 The Royal Society of Chemistry.


Wang G.-G.,Jiangsu University | Guo L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Duan H.,Northeast Normal University | Wang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Computational and Theoretical Nanoscience | Year: 2014

A novel robust meta-heuristic optimization algorithm, which can be considered as an improvement of the recently developed firefly algorithm, is proposed to solve global numerical optimization problems. The improvement includes the addition of information exchange between the top fireflies, or the optimal solutions during the process of the light intensity updating. The detailed implementation procedure for this improved meta-heuristic method is also described. Standard benchmarking functions are applied to verify the effects of these improvements and it is illustrated that, in most situations, the performance of this improved firefly algorithm (IFA) is superior to or at least highly competitive with the standard firefly algorithm, a differential evolution method, a particle swarm optimizer, and a biogeography-based optimizer. Especially, this new method can accelerate the global convergence speed to the true global optimum while preserving the main feature of the basic FA. © 2014 American Scientific Publishers.


Ma H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Han D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhu G.,Northeast Normal University
Journal of Materials Chemistry A | Year: 2015

A series of core-shell porous aromatic frameworks (PAFs) are synthesized for selective detection of nitro-explosives. The conjugated core-shell PAFs possess large surface areas, which can facilitate the pre-concentration of a targeted analyte, leading to superior sensitivity. The tunable LUMO energy levels of these core-shell PAFs make them selectively detect high explosive TNT and TNP from other competing nitro compounds. Moreover, vapor phase detection of nitro aromatics using PPC-PPyS-PAF-2 exhibits a two dimensional fluorescence signal response toward different nitro aromatics. The power to accurately recognize nitro aromatic explosives in the fluorescent 2D map highlights the core-shell PAFs as very promising materials for nitro explosive sensing. © The Royal Society of Chemistry 2015.


Lin X.-D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xue C.,Southwest Research Institute | Liu X.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang J.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wei P.-F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2012

Wavefront correctors are the key components of the adaptive optical systems and the techniques to fabricate wavefront correctors have been developed for many years. This paper introduces several kinds of wavefrom correctors that are commonly used in adaptive optical systems, such as the deformable mirror with discrete actuators and continuous faceplate, segmented deformable mirror, membrane deformable mirror, bimorph deformable mirror, MEMS deformable mirror, liquid crystal corrector and the adaptive secondary mirror. The realization methods of the wavefront correctors and their working principles are presented in detail, and the performance, the number of degrees of freedom and the speed of response are compared. Finally, it summarizes the technology innovations and development trends of the wavefront correctors in the new applications.


Lin Y.,Northeast Normal University | Lin Y.,Beihua University | Jiang D.,Northeast Normal University | Wang S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Physica A: Statistical Mechanics and its Applications | Year: 2014

In this paper, we consider a stochastic SIS epidemic model with vaccination. We prove that the densities of the distributions of the solution can converge in L1 to an invariant density under appropriate conditions. Also we find the support of the invariant density. © 2013 Elsevier B.V. All rights reserved.


Guo X.,Northeast Normal University | Li B.,Northeast Normal University | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Luminescence | Year: 2012

Novel pyrene functionalized mesoporous coreshell structured silica (denoted as SiO 2@mSiO 2/Py-Si) was designed and synthesized as a highly selective fluorescent chemosensor for detecting Hg 2+ in water. The coreshell structured silica was prepared by a simple solgel process through coating SiO 2 nanospheres with a layer of ordered mesoporous silica. The surface of outer mesoporous silica shell was then further functionalized by the fluorescent chromophore alkoxysilane modified pyrene (Py-Si). XRD data confirmed that the hexagonal ordered mesoporous structure was preserved after functionalization. The chemosensing material successfully exhibited a remarkable turn on response toward Hg 2+ over miscellaneous metal ions. A good linear response towards Hg 2+ in the concentration range of 10 -810 -4 M was constructed with R 2+=0.9913. Most importantly, a satisfactory detection limit of 3.4×10 -9 g mL -1 (down to ppb level) was obtained, which is 100 times lower than our previous report of covalently grafted Py-OH to the bulk mesoporous silica SBA-15. These results indicated that SiO 2@mSiO 2/Py-Si can be used as a highly selective and sensitive fluorescence sensor for Hg 2+. © 2012 Elsevier B.V.


Deng Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Deng Y.,University of Chinese Academy of Sciences | Chen X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Nanoscale | Year: 2014

Fluorescent carbon dots (CDs) have received great research interest in recent years, with applications in areas such as bio-imaging and chemical sensing. However, solid state photoluminescence of CDs and its related applications (e.g. optoelectronics) is a less explored territory. Here, we have systematically studied the photo emission of CDs in solid state. We found that their blue emission is highly dependent on whether the environment contains polar groups or not. Mechanism studies show that the blue emission of CDs may come from their CO bonds conjugated with aromatic carbons, and the interaction between polar groups in environment and CO bonds in CDs is responsible for the environment-dependent photo emission. Our conclusion here should assist the development of CDs' solid state applications. © 2014 the Partner Organisations.


Zhu S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhu S.,University of Chinese Academy of Sciences | Zhang X.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2014

To improve the accuracy of Ritchey-Common test for a flat mirror, a new method to use the relationship between the system pupil coordinate and the test mirror coordinate to interpolate and fit the test mirror surface was proposed. On the basis of the least square method, the system defocus error and surface error in two test angles were detached to gain a more actual flat surface error. The simulation analysis shows that the test error can be controlled under λ/100(λ=632.8 nm). A flat mirror with a diameter of 40 mm was tested. In the test process, the test flat mirror was rotated with different angels and the wavefront was reconstructed through the relationship between coordinate mapping and amplitude conversion. The obtained results show that the RMS of the test mirror surface is 0.018 6 λ after detaching the defocus error of the system. As compared with the test RMS of 0.021λ from an interferometer, the residual error is 0.002 4 λ. Experiment results indicate that this error detaching method is valid and accurate in the Ritchey-Common test for flat mirrors.


Fan M.M.,University of Chinese Academy of Sciences | Fan M.M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu K.W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Z.Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 5 more authors.
Applied Physics Letters | Year: 2014

High Mg content mixed-phase Zn0.38Mg0.62O was deposited on a-face sapphire by plasma-assisted molecular beam epitaxy, based on which a metal-semiconductor-metal solar-blind ultraviolet (UV) photodetector was fabricated. The dark current is only 0.25pA at 5V, which is much lower than that of the reported mixed-phase ZnMgO photodetectors. More interestingly, different from the other mixed-phase ZnMgO photodetectors containing two photoresponse bands, this device shows only one response peak and its -3dB cut-off wavelength is around 275nm. At 10V, the peak responsivity is as high as 1.664 A/W at 260nm, corresponding to an internal gain of ∼8. The internal gain is mainly ascribed to the interface states at the grain boundaries acting as trapping centers of photogenerated holes. In view of the advantages of mixed-phase ZnMgO photodetectors over single-phase ZnMgO photodetectors, including easy fabrication, high responsivity, and low dark current, our findings are anticipated to pave a new way for the development of ZnMgO solar-blind UV photodetectors. © 2014 AIP Publishing LLC.


Jia P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu N.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu N.,University of Chinese Academy of Sciences | Zhang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

A target recognition method was proposed to recognize targets with different scales, view-points and illuminations automatically. First, a scale space of images was established, and the local key points in the scale space were extracted by incorporating the Hessian and Harris scale-space detectors. Then, the main orientations of the key points and orientation histograms were calculated and 128 element feature vectors for each key point were established, in which these feature vectors were invariant in different rotations and illuminants. To reinforce the performance, principle component analysis was incorporated to reduce the dimensionality of feature vectors and improve calculating speeds for the recognition. The nearest feature space classifier was used for increasing the recognition speeds in robustness. Experiment results show that this proposed method achieves a significant improvement in automatic target recognition rate, and the recognition rates for varied view-points, scales and illuminations are 61.9%, 80.5%, and 84.4%, respectively. Compared with the Scale Invariant Feature Transform (SIFT) and Speeded Up Robust Features (SURF), the proposed method achieves a significant improvement in automatic target recognition rate in presence of varying viewpoints, scales and illuminations.


Liu J.-S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu J.-S.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Optics Letters | Year: 2013

MgZnO heterostructure light-emitting devices (LEDs) have been fabricated from p-Mg0.35Zn0.65O/n-Mg0.20Zn0.80O structures, and the p-type Mg0.35Zn0.65O film was realized using a lithium-nitrogen codoping method. Obvious ultraviolet emission peaked at around 355 nm dominates the electroluminescence (EL) spectra of the device at room temperature, which comes from the near-band-edge emission of the n-type Mg0.20Zn0.80O film. This is the first report on MgZnO heterostructured LEDs and the shortest EL emission ever reported in ZnO-based p-n junction LEDs to the best of our knowledge. © 2013 Optical Society of America.


Yang J.,University of Chinese Academy of Sciences | Yang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lv W.,University of Chinese Academy of Sciences | And 5 more authors.
Optics Letters | Year: 2013

We present a method of achieving a wide-angle, lightweight, optical see-through, distortion-free head-mounted display (HMD) by using two similar ellipsoids. An HMD that achieves a single channel field-of-view (FOV) of 120° × 120° with a 6 mm eye box and a total binocular FOV of 160° × 120° with an 80° field overlap is designed as an example. This method can solve the complex tiling problem and the distortion problem of other catadioptric structures. This structure is used to offset distortion and correct aberrations. © 2013 Optical Society of America.


Gu T.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Gu T.,University of Chinese Academy of Sciences | Wang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings - IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011 | Year: 2011

This paper presents a digital watermarking algorithm based on the DWT coefficients. This algorithm does not change any information of the original image, but combines the information of low frequency DWT coefficients and the watermark image. The combination is the key, which is used to extract the watermark. When we need to extract the watermark, we can obtain it by divide the key. Because the algorithm does not change any information of the original image, it will not affect the quality of the original image. Experimental results show that the proposed algorithm is robust and secure against a wide range of image processing operations. © 2011 IEEE.


Xue Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xue Q.,University of Chinese Academy of Sciences | Wang S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

Limb imaging spectrometer is an important new remote sensor for research and application of atmospheric remote sensing. The principle of atmospheric sounding using limb imaging spectrometer is analyzed. The prototype of grating dispersion type UV/visible limb imaging spectrometer is designed and manufactured. It consists of a broad-band refractive achromatic fore telescope optical system and a modified Czerny-Turner spectral imaging system. The fore telescope system is telecentric in image space and the spectral imaging system is telecentric in object space. It works over the spectral range of 540-780 nm (1st order) and 270-390 nm (2nd order). It records images from 540-780 nm when the visible filter in place, and 270-390 nm when the UV filter in place. The volume of the prototype is about 450 mm×250 mm×200 mm, and the total mass is about 8 kg. The test result demonstrates that the spatial resolution is 0.45 mrad and the spectral resolution of the prototype is 1.3 nm. Both spatial and spectral resolution satisfy the design requirement. The volume of the prototype is small and the mass is light, so it is suitable for spatial remote sensing.


Zhang S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang S.,University of Chinese Academy of Sciences | Sun H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2012

In order to improve the precision of laser spot position measurement, several key technologies are studied. Range-gated technology is studied to restrain laser backscattering caused by aerosol scattering. An asynchronous range-gated method based on four-quadrant detector is introduced. An improved blind deconvolution method used to process images afterwards is introduced, which serves to lower the impact of atmosphere turbulence on laser spot imaging. An image registration method based on objective area is introduced to eliminate the difference between visible camera and infrared camera. Recover the spot and find the laser spot position using Gauss surface fitting. The experimental results show that the precision of laser spot position is not more than 0.3 pixel.


Yang P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yang P.,University of Chinese Academy of Sciences | Ai H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2012

In order to reduce the impact of atmosphere disturbance and communication terminal relative motion to the performance of communication system, the circular polarization modulation is adopted. The circular polarization modulation has high reliability since the polarization properties of laser change relatively small while propagating through the atmosphere. Because of the rotational symmetry of circular polarization, the system performance is unaffected by the relative motion of the two terminals, and is especially suitable for mobile communications terminal. Two kinds of circular polarization modulation method are introduced, i.e., circular polarization shift keying (CPolSK) and circular polarization division multiplexing (CPolDM). The conversion process between the linear polarization and circular polarization provides a theoretical basis for the circular polarization encoding and decoding. In view of these two kinds of modulation modes, the implementation is put forward, and the laser communication system of circular polarization modulation is designed. Two modulation schemes can be verified in the same system. The laser communication system is very simple and convenient, which could be used in space borne communication terminal. The communication system is verified with simple experiments, completing the transmitting and receiving of data to prove the feasibility of circular polarization modulation.


Yan L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yan L.,University of Chinese Academy of Sciences | Wang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zheng L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Optics Express | Year: 2013

Applying the iterative triangulation stitching algorithm, we provide an experimental demonstration by testing a Φ120mm flat mirror, a Φ1450mm off-axis parabolic mirror and a convex hyperboloid mirror. By comparing the stitching results with the self-examine subaperture, it shows that the reconstruction results are in consistent with that of the subaperture testing. As all the experiments are conducted with a 5-dof adjustment platform with big adjustment errors, it proves that using the above mentioned algorithm, the subaperture stitching can be easily performed without a precise positioning system. In addition, with the algorithm, we accomplish the coordinate unification between the testing and processing that makes it possible to guide the processing by the stitching result. © 2013 Optical Society of America.


Zhou W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhou W.,University of Chinese Academy of Sciences | Wu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yu M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 5 more authors.
Optics Letters | Year: 2013

We propose a novel structure that can achieve extraordinary optical absorption over the visible spectrum, based on the guided-mode resonance effect. An optical metal grating with moderate thickness and high filling factor can lead to coupling between the quasi-guided-mode and cavity mode. The resonant interaction between the two modes can influence the field distribution, such as the magnetic field near the grating, which results in extraordinary absorption. Absorption efficiency can be optimized up to 99.16%. We also show that the absorption peak can be readily tuned just by varying the subwavelength grating period. © 2013 Optical Society of America.


Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,University of Chinese Academy of Sciences | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 5 more authors.
Optics Letters | Year: 2013

We report a large enhancement of yellow photostimulated luminescence (PSL) by codoping Tm3+ in Sr3SiO5:Eu2+ upon infrared stimulation at 980 nm after pre-exposure in Ultraviolet light. The initial PSL intensity and light storage capacity are enhanced by a factor of 33 and 2, respectively, for Tm3+ concentration at 0.0004. The thermoluminescence spectra indicate that codoping Tm3+ generates a trap peaking at 385 K. The trap is much more sensitive to infrared light than the original one, so that the light storage period of the material is beyond tens of days with the minimum detectable infrared power density only 54 μW/cm2. © 2013 Optical Society of America.


Zheng Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zheng Y.,University of Chinese Academy of Sciences | Liang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optics Express | Year: 2013

A model of miniaturized space-modulated Fourier transform infrared spectrometer (FTIR) is given. The two step mirrors as the key components are designed and a lithography-electroplating technique used to fabricate the small step mirror is proposed. We analyze the effect of the experiment results resulted from fabricating technics on the recovery spectrum in theory, and demonstrate that the lithography-electroplating technique is an effective method to fabricate the step mirror, which make miniaturized FTIR realized. We believe that the performances of FTIR can be better realized by optimizing experimental conditions to make this fabricating method more attractive. © 2013 Optical Society of America.


Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,University of Chinese Academy of Sciences | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
ACS Applied Materials and Interfaces | Year: 2013

Synthesis and luminescent properties of Ce3+-doped SrAlSi 4N7 yellow-emitting phosphor are reported. In comparison with YAG: Ce3+, the phosphor exhibits smaller thermal quenching and a broader emission band centering at 555 nm with a bandwidth as large as 115 nm, being suitable for fabricating high color rendering white LED. It is observed in material synthesis that intense luminescence can be achieved only in case of excessive AlN in the raw materials. The role of the excessive AlN is studied. The mechanism for existence of edge-sharing [AlN4] tetrahedral, which is unreasonable according to the aluminum avoidance principle, is discussed in detail. © 2013 American Chemical Society.


Zheng M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xie Z.,CAS Changchun Institute of Applied Chemistry | Qu D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qu D.,University of Chinese Academy of Sciences | And 5 more authors.
ACS Applied Materials and Interfaces | Year: 2013

Chromium(VI) [Cr(VI)] is considered as a severe environmental pollutant, due to its highly toxic and carcinogenic properties. Therefore, low cost, highly sensitive sensors for the determination of Cr(VI) are highly demanded. It is well-known that highly luminescent carbon dots (CDs) have been successfully applied as fluorescent nanosensors for pH, ions, and molecular substances. In the present work, we have demonstrated an on-off fluorescent CD probe for detecting Cr(VI) based on the inner filter effect (IFE) because the absorption bands of Cr(IV) fully covered the emission and excitation bands of CDs. This CD-based nanosensor provides obvious advantages of simplicity, convenience, rapid response, high selectivity, and sensitivity, which have potential application for the detection of Cr(VI) in the environmental industry. In addition, because Cr(VI) can be reduced to low valent chromium species easily by reductant, resulting in the elimination of the IFE and recovery of CD fluorescence, the CD-Cr(VI) mixture could behave as an off-on type fluorescent probe for reductant. We employed ascorbic acid (AA) as an example molecule to demonstrate this off-on type fluorescent probe. © 2013 American Chemical Society.


Dai H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Dai H.,University of Chinese Academy of Sciences | Yan C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optics Express | Year: 2014

Rotatable retarder fixed polarizer (RRFP) Stokes polarimeters, which employ uniformly spaced angles over 180° or 360°, are most commonly used to detect the state of polarization (SOP) of an electromagnetic (EM) wave. The misalignment error of the retarder is one of the major error sources. We suppose that the misalignment errors of the retarder obey a uniform normal distribution and are independent of each other. Then, we derive analytically the covariance matrices of the measurement errors. Based on the covariance matrices derived, we can conclude that 1) the measurement errors are independent of the incident intensity s0, but seriously depend on the Stokes parameters (s 1, s2, s3) and the retardance of the retarder δ; 2) for any mean incident SOP, the optimal initial angle and retardance to minimize the measurement error both can be achieved; 3) when N = 5, 10, 12, the initial orienting angle could be used as an added degree of freedom to strengthen the immunity of RRFP Stokes polarimeters to the misalignment error. Finally, a series of simulations are performed to verify these theoretical results. © 2014 Optical Society of America.


Wu S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu S.,University of Chinese Academy of Sciences | Li Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Luo J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Optics Express | Year: 2014

A transparent conductive oxide (TCO) Pr and F co-doped SnO2 (PFTO) film is prepared by ion-assisted electron beam deposition. An optimized PFTO film shows a high average visible optical transmittance of 83.6% and a minimum electrical resistivity of 3.7 × 10-3 Ω·cm corresponding to a carrier density of 1.298 × 1020 cm -3 and Hall mobility of 12.99 cm2/V.s. This PFTO film shows a high work function of 5.147 eV and favorable surface morphology with an average roughness of 1.45 nm. Praseodymium fluoride is found to be an effective material to dope F into SnO2 that can simplify the fabrication process of SnO2-based TCO films. © 2014 Optical Society of America.


Wang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Y.,University of Chinese Academy of Sciences | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Song H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
ACS Applied Materials and Interfaces | Year: 2013

We report the facile synthesis and easy operation of a smart delivery system based on core-shell structured magnetic mesoporous silica nanocomposites covalently grafted with light-responsive azobenzene derivatives, which integrates magnetic targeting and stimuli-responsive release property. Irradiation with visible light triggers the release of guest molecules loaded in the mesopores. © 2012 American Chemical Society.


Jin F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jin F.,University of Chinese Academy of Sciences | Chu B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Optics Express | Year: 2014

We demonstrate a highly efficient inverted small molecular solar cell with integration of Ag nanoparticles (NPs) into the devices. The optimized device based on thermal evaporated Ag NPs provides a power conversion efficiency (PCE) of 4.87%, which offers 33% improvement than that of the reference device without Ag NPs. Such a high efficiency is mainly attributed to the improved electrical properties by virtue of the modification of the surface of ITO with Ag NPs and the enhanced light harvesting due to localized surface plasmon resonance (LSPR). The more detail enhanced mechanism of the PCE by introduction of Ag NPs is also discussed. © 2014 Optical Society of America.


Hu G.C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Hu G.C.,University of Chinese Academy of Sciences | Shan C.X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Shan C.X.,University of Chinese Academy of Sciences | And 5 more authors.
Optics Express | Year: 2015

Ga2O3 photodetectors with interdigitated electrodes have been designed and fabricated, and the Ga2O3 area exposed to illumination acts as the active layer of the photodetector, while the area covered by Au interdigital electrode provide an arena for carrier multiplication. The photodetectors show a maximum responsivity at around 255 nm and a cutoff wavelength of 260 nm, which lies in the solar-blind region. The responsivity of the photodetector reaches 17 A/W when the bias voltage is 20 V, which corresponds to a quantum efficiency of 8228%, amongst the best value ever reported in Ga2O3 film based solar-blind photodetectors. © 2015 Optical Society of America.


Ni P.-N.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ni P.-N.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang S.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Optics Letters | Year: 2012

By employing an insulating zinc oxide (i-ZnO) as an electron accelerating layer, and an n-type ZnO as an active layer, ultraviolet (UV) emissions at 385 nm caused by the excitation of the n-ZnO layer by the accelerated electrons from the i-ZnO layer have been realized. By replacing the active layer with larger bandgap Mg0.39Zn0.61O and properly optimizing the structure, shorter wavelength emissions at around 328 nm have been obtained. Considering that the p-type doping of wide bandgap semiconductors is still a challenging issue, the results reported in this Letter may provide a promising alternative route to UV emissions. © 2012 Optical Society of America.


Du P.,University of Chinese Academy of Sciences | Jing P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Cao Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Small | Year: 2015

Localized surface plasmon resonance (LSPR), light scattering, and lowering the series resistance of noble metal nanoparticles (NPs) provide positive effect on the performance of photovoltaic device. However, the exciton recombination on the noble metal NPs accompanying above influences will deteriorate the performance of device. In this report, surface-modified Ag@oxide (TiO2 or SiO2) nanoprisms with 1-2 nm shell thickness are developed. The thin film composed of P3HT/Ag@oxides and P3HT:PCBM/Ag@oxides is investigated by absorption, photoluminescence (PL), and transient absorption spectroscopy. The results show a significant absorption, PL enhancement, and long-lived photogenerated polaron in the P3HT/Ag@TiO2 film, indicating the increase of photogenerated exciton population by LSPR of Ag nanoprisms. In the case of P3HT/Ag nanoprisms, partial PL quench and relatively short-lived photogenerated polaron are observed. That indicates that the oxides layer can effectively avoid the exciton recombination. When the Ag@oxide nanoprisms are introduced into the active layer of P3HT:PCBM photovoltaic devices, about 31% of power conversion efficiency enhancement is obtained relative to the reference cell. All these results indicate that Ag@oxides can enhance the performance of the cell, at the same time the ultrathin oxide shell prevents from the exciton recombination. Ag@oxide core/shell nanoprisms are sucessfully embedded into the active layer of organic solar cells. The plasmonic effect of Ag nanoprisms enhances the photogenerated excitons of the active layer. The oxide shell effectively depresses the recombination of photo-generated electrons and holes. An improved performance is obtained for the solar cell device. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Deng Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Deng Y.,University of Chinese Academy of Sciences | Liu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Journal of Computational Physics | Year: 2011

This paper discusses the topology optimization of unsteady incompressible Navier-Stokes flows. An optimization problem is formulated by adding the artificial Darcy frictional force into the incompressible Navier-Stokes equations. The optimization procedure is implemented using the continuous adjoint method and the finite element method. The effects of dynamic inflow, Reynolds number and target flux on specified boundaries for the optimal topology of unsteady Navier-Stokes flows are presented. Numerical examples demonstrate the feasibility and necessity of this topology optimization method for unsteady Navier-Stokes flows. © 2011 Elsevier Inc.


Xu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu W.,University of Chinese Academy of Sciences | Huang W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

A new lens designed for the long focal length, catadioptric zoom telescope is presented. By setting the variable diaphragm near the primary mirror, there is no necessity to use a floating variable diaphragm in the zoom part. Then using the re-imaging form and field lens, the zoom part only contains variator and compensator, without focus unit and primelens as usual and there is no unusual partial dispersion glass used for the correction of secondary spectrum, so the complexity of zoom part is greatly reduced. By using this new lens form, a catadioptric zoom telescope working in the visible wavelength band with variable focal length between 600 and 3000 mm, 300 mm maximum aperture is designed and then optimized. The modulation transfer function (MTF) of this optimized lens is greater than 0.3 at 60 lp/mm across all the focal lengths and field of view. The result indicates that this lens reaches good image quality and is cost-effective for manufacture, so this new lens is very suitable for the long focal length, visible zoom imaging system.


Zhou W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Song C.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Song C.,University of Chinese Academy of Sciences | And 5 more authors.
Optics Express | Year: 2015

A polarization-independent and omnidirectional nearly perfect absorber in the visible region has been proposed. The absorber is two-layer structure consisting of a subwavelength metal grating layer embedded in the high refractive index and lossless dielectric layer on the metal substrate. Extraordinary optical absorption with absorption peaks of over 99% can be achieved over the whole visible region for both TM and TE polarization. This absorption is attributed to cavity mode (CM) resonance caused by the coupled surface plasmon polaritons (SPP). Through adjusting the grating thickness, the absorption peak can be tuned linearly, which is highly advantageous to design various absorbers. Furthermore, the absorbance retains ultra-high over a wide angular range of incidence for both TM and TE polarization. This nearly perfect absorber offers great potential in the refractive index (RI) sensors, integrated photodetectors, solar cells and so on. © 2015 Optical Society of America.


Qu D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qu D.,University of Chinese Academy of Sciences | Zheng M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Du P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 9 more authors.
Nanoscale | Year: 2013

A facile hydrothermal synthesis route to N and S, N co-doped graphene quantum dots (GQDs) was developed by using citric acid as the C source and urea or thiourea as N and S sources. Both N and S, N doped GQDs showed high quantum yield (78% and 71%), excitation independent under excitation of 340-400 nm and single exponential decay under UV excitation. A broad absorption band in the visible region appeared in S, N co-doped GQDs due to doping with sulfur, which alters the surface state of GQDs. However, S, N co-doped GQDs show different color emission under excitation of 420-520 nm due to their absorption in the visible region. The excellent photocatalytic performance of the S, N co-doped GQD/TiO2 composites was demonstrated by degradation of rhodamine B under visible light. The apparent rate of S, N:GQD/TiO2 is 3 and 10 times higher than that of N:GQD/TiO2 and P25 TiO2 under visible light irradiation, respectively. © 2013 The Royal Society of Chemistry.


Guo L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guo L.,University of Chinese Academy of Sciences | Wu Q.-W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

To ensure a proper averaged temperature and a temperature gradient of a space spectral imaging apparatus, the characteristics of thermal design for the space spectral imaging apparatus were discussed and analyzed. According to the design feature and the heat transfer path in the spectral imaging apparatus, a thermal design scheme for the apparatus was presented and the thermal equilibrium equation and a numerical analysis model of the heat transfer for the apparatus were established by finite element analysis method. Based on given temperature boundary conditions, the steady-state thermal analysis of the apparatus was carried out through a finite element thermal analysis software IDEAS-TMG. The thermal response performance and steady-state temperature profiles of key parts in the apparatus were given. Thermal analysis shows that the averaged temperature value and maximum temperature gradient value of the apparatus in steady-state are 17.3~23.7°C and 1.3°C, which has met the requirements of heat control, and can supply a theoretical warrant for reliability and optimization of thermal design. Thermal design scheme was also verified through a thermal test and obtained results are well coincident with that derived from confirmatory test and numerical analysis. The maximum deviation between thermal analysis and thermal test are not exceeding 8%. The correctness of numerical simulation and the validity of temperature prediction were verified. In thermal test, the averaged temperature value and maximum temperature gradient value of the apparatus are 17.2~22.5°C and 1.4°C, respectively.


Liu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Gao Q.,University of Chinese Academy of Sciences | Zhang P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xuan M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Structural and Multidisciplinary Optimization | Year: 2011

This note presents topology optimization of fluid channels with flow rate equality constraints. The equality constraints on the specified boundaries are implemented using the lumped Lagrange multiplier method. The quadratic penalty term and cut-off sensitivity are used to maintain the stability of optimization. © 2010 Springer-Verlag.


Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang J.,University of Chinese Academy of Sciences | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jiang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chemical Communications | Year: 2012

The first optical sensor for Cu(ii) detection, with upconverting luminescent nanoparticles as an excitation source, showing high selectivity and good linear Stern-Volmer characteristics, has been achieved through a fluorescence resonance energy transfer (FRET) process between NaYF 4:Yb 3+/Er 3+ and RB-hydrazide. The sensing mechanism is then discussed. © 2012 The Royal Society of Chemistry.


Yang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yang Y.,University of Chinese Academy of Sciences | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guan Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Journal of Luminescence | Year: 2014

Triphenylamine based fluorescent dyes TPA-benzimidazole and TPA-benzothiazole have been designed and synthesized. The TPA-benzimidazole chemosensor was tested for a number of metal ions and found to exhibit binding affinity for Fe3+ and Hg2+ in acetonitrile, and the fluorescence quenching was achieved through a PET process. The appearance of an isosbestic point in absorption titrations and Job's plot analysis supported 1:1 stoichiometries for Fe3+ and Hg2+ ions. Laser experiments showed that under transversal pumping with a Q-switched Nd:YAG (355 nm) laser in toluene, TPA-benzothiazole exhibits efficient and stable amplified spontaneous emissions (ASE) at 436 nm. © 2013 Elsevier B.V.


Shen H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Shen H.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qiao Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Journal of Materials Chemistry C | Year: 2013

Ag nanoparticle surface plasmon enhanced ZnO homojunction light-emitting devices (LEDs) have been constructed. It is found that the Ag nanoparticles can increase the emission of the devices greatly, and the Ag nanoparticle decorated LEDs degrade little after placing in ambient air for three months, revealing their good stability. © 2013 The Royal Society of Chemistry.


Qiao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qiao J.,University of Chinese Academy of Sciences | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Dalton Transactions | Year: 2014

The energy transfer and luminescence properties in the Ce3+ and Pr3+ co-activated Ca3Sc2Si3O 12 (CSS) silicate garnet are studied in our work. The addition of Pr3+ exhibits a red emission around 610 nm in the green phosphor CSS:Ce3+, but the amount of Pr3+ incorporated into the phosphor is very limited due to the charge mismatch when Pr3+ substitutes for Ca2+ in CSS. In order to promote Pr3+ incorporation into CSS lattices to enhance the red emission component, the addition of Mg2+ incorporated into Sc3+ site is performed to compensate the residual positive charge caused by the substitution of Pr 3+ for Ca2+ in CSS. Finally, a white LED with color rendering index of 80 and correlated color temperature of 8715 K is obtained by combining the single CSS:0.05Ce3+, 0.01Pr3+, 0.3Mg 2+ phosphor with a blue-emitting InGaN LED chip. © 2014 The Royal Society of Chemistry.


Ni P.-N.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ni P.-N.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang S.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Journal of Materials Chemistry C | Year: 2013

Self-powered, highly spectrum-selective photodetectors have been fabricated from n-ZnO/p-NiO core-shell nanowire arrays. In the structure, the outer-layer of the p-NiO acts as a "filter" which can filter out the photons with short wavelength. In this way, highly spectrum-selective photodetectors that only respond to a narrow spectrum range have been obtained. © 2013 The Royal Society of Chemistry.


Xiao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xiao J.,University of Chinese Academy of Sciences | Wei X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Lu Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Renewable and Sustainable Energy Reviews | Year: 2012

The surface shape and optical quality of the solar concentrators have a great influence on the solar power plant efficiency, and there need an accurate, inexpensive and fast tool to do this measurement work at the plant start up and during operation. The development of the measurement methods of the solar concentrators over the past several decades was reviewed, and three types of the measurement methods: video scanning Hartmann optical test (VSHOT), photogrammetry and deflectometry were introduced in detail. A comparison of the different methods was made, and an outlook is also put forth. © 2012 Elsevier Ltd. All rights reserved.


Ni P.-N.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Ni P.-N.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Shen D.-Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Physics Letters | Year: 2014

High Mg-content single-phase wurtzite MgZnO alloys with a bandgap of 4.35 eV have been obtained on sapphire substrate by introducing a composition-gradient MgxZn1-xO buffer layer. By employing the accelerated electrons obtained in a solid-state structure as an excitation source, an emission at around 285 nm, which is originated from the near-band-edge emission of the Mg0.51Zn0.49O active layer, has been observed. The results reported in this paper may provide a promising route to high performance deep-ultraviolet light-emitting devices by bypassing the challenging doping issues of wide bandgap semiconductors. © 2014 AIP Publishing LLC.


Tu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Tu L.,University of Amsterdam | Tu L.,University of Chinese Academy of Sciences | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 6 more authors.
Chemical Society Reviews | Year: 2015

Recent efforts and progress in unraveling the fundamental mechanism of excitation energy migration dynamics in upconversion nanomaterials are covered in this review, including short- and long-term interactions and other interactions in homogeneous and heterogeneous nanostructures. Comprehension of the role of spatial confinement in excitation energy migration processes is updated. Problems and challenges are also addressed. This journal is © The Royal Society of Chemistry.


Wang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang L.,University of Chinese Academy of Sciences | Li B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Luo Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Dalton Transactions | Year: 2013

A simple organic molecule of 2-naphthol-1-aldehyde-conjugated thiourea (denoted as receptor 1) is designed and prepared. Absorption and fluorescence spectra response profiles of receptor 1 with different ionic inputs vary significantly in a DMSO-H2O solution (V/V = 9 : 1) through modulating intramolecular charge transfer (ICT) processes. In particular, the changes of the dual-modal spectra when anions, such as F-, AcO- or H2PO4 -, are introduced in such an aqueous solution indicate that receptor 1 could be tolerant to H2O at least to some extent in recognizing anions. On the basis of the above results, binary logic operations (OR, NOR and INHIBIT) and their multiply-logic functions with different combinations have been achieved at the molecular level by changing different chemical inputs. The output signals can be encoded as absorption and fluorescence dual-mode, depending on the choice of 2-naphthol as the chromophore and fluorophore core. © 2013 The Royal Society of Chemistry.


Zhao Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao Z.,University of Chinese Academy of Sciences | Liu J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

In order to retrieve the defocus in the optical system of airborne camera caused by the changes of temperature, pressure and other environment parameters in high altitude, focus measure algorithm based on power spectra and auto-focus search strategy are represented. Firstly, it is introduced that the power spectra of images taken from different region has the characteristic of invariance. Two betterments over the power spectra sum (PSS) focus measure function are proposed based on the main attenuation of power spectra in the high frequency. Then, full search (FS) strategy using changed steps is proposed in order to reduce the focus error caused by noise from environment. The results show that the FS strategy can locate the optimal focus position accurately when using search step length of 1 mm. The focus error is 0.3 mm which fulfills the requirement of system. The PSS proposed algorithms can indicate the defocus state of images taken by airborne camera, and it can also improve the properfies of saturation region and sensitiveness of the focus measure curve respectively. Search steps shorter than focus-depth can guarantee the validity of the result.


Li J.-D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li J.-D.,University of Chinese Academy of Sciences | Zhang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jia P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

As conventional super-resolution algorithms can not implement the motion estimation and reconstruction for an image with local motion in practical engineering applications, this paper proposed a super-resolution reconstruction algorithm based on NonLocal Means (NLM). First, the NLM filter, one of the successful denoising filters in recent years, was introduced briefly. Then, the details concerning its application to super-resolution were analyzed by creating a super-resolution cost function. By considering the practical situations and the need of the engineering facet, a scheme to simplify the procedure in the NLM super-resolution algorithm was proposed. The experiment results show that the simplified algorithm can not only effectively implement super-resolution reconstruction to get a clear and detailed image without explicit motion estimation, but also can obtain a reconstructed speed higher 30% than that of conventional algorithms. It can satisfy the practical needs of engineering settings and is expected to reconstruct the high resolution image with complex motion.


Wang Y.-F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li L.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li L.-Y.,University of Chinese Academy of Sciences
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

In consideration of stray light sources of a star photoelectric-detection system, this paper analyzes the generation of the stray light and its transmission characteristics, and proposes how to evaluate the effects of stray light on the photoelectric-detection system. A reasonable suppression scheme for the stray light is provided for guiding the design of opto-mechanical structure of the system. Then the main baffle, baffle vane and the coating technology are used to eliminate the effect of stray light on the opto-mechanical structure. The opto-mechanical structure of the system is simulated by a software and the results show that their Point Source Transmittances (PSTs) before and after eliminating the stray light have been reduced by two orders of magnitude between 10 -8 and 10 -10. Meanwhile, the obtained detection data in experimental field demonstrate that the scheme can extract a detection image with 5 star magnitudes, and the stray light has been suppressed effectively.


Wang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang Y.,University of Chinese Academy of Sciences | Yan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

A calculating model based on difference method was proposed to calculate the image motion velocity vector to compensate precisely the image motion of a space camera. Firstly, the earth imaging model was established by utilizing coordinate transformation, and the relative motion between the image point and the image plane was analyzed in vertical, roll and pitch attitudes according to the states of the image motion. Then, a method was proposed to calculate the image motion velocity vector according to the law of the relative motion between the image point and the image plane. Finally, the proposed method was compared with the coordinate transformation method. The result shows that the error between the two methods is within 0.1%, which proves the efficiency of this method. The proposed method overcomes the complex compulation from traditional methods and can be used in calculating the image motion velocity vectors for other space cameras.


Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,University of Chinese Academy of Sciences | Xiang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

If in the telecentric off-axis three-mirror imaging system there is a beam-limited device in front of space remote instrument, a real entrance pupil to match is required. To meet this need, optical design of off-axis three-mirror system whose aperture stop coincides with the object focal plane in front of the primary mirror is studied. The expressions of configuration parameters and the interval between the object focus and the primary mirror of off-axis three-mirror system are deduced in case that the primary mirror and the tertiary mirror are coplanar. The condition and solution of achieving real object focus are defined. Based on the method, with the specific requirements of 1.0-2.5 μm spectral range, F-number 4,360 mm focal length, 5° field of view (FOV), a telecentric off-axis three-mirror system with real entrance pupil is designed. And the imaging quality of system approaches the diffraction limit at full FOV in the required wave band. The highest aspheric order is four. The result indicates that this method can be used in design of telecentric off-axis three-mirror imaging system with real entrance pupil.


He X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | He X.,University of Chinese Academy of Sciences | Ma J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

As conventional phase shifting interferometers can not test the wavefront aberration from a large diameter and long optical path system accuracely, a new commonpath shearing interferometer is designed to elimnate the system error introduced by the standard wavefront. The new design takes an agglutination prism consisting of a triangular prism and a rhombic prism as a shear device to produce interference by the wavefront under-test with its replication. A group of different relative aperture lens switching devices are used to control the shearing ratio of the shearing interferometer. Compared with the data from 4D dynamic interferometers under different temperature conditions, it shows that the repeatability of designed shearing interferometer is about λ/80 and the accuracy of root mean square is better than λ/80(λ=630 nm). The design of the commonpath shearing interferometer greatly reduces its dimension and weight and also improves the experiment efficiency for long optical path interference measurement.


Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,University of Chinese Academy of Sciences | Xiang Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

In order to meet the needs of the wide field-of-view (FOV) imaging spectrometer development, the problem about optical design of telecentric, wide FOV, large relative aperture, off-axis three-mirror system is studied, and the expressions of initial configuration parameters and the third-order aberrations for flat field, telecentric, three\|mirror system are educed. With the specific requirements of 0.4~2.5μm spectral range, F number is 4, 720 mm focal length, 10° FOV, a flat field, telecentric, off-axis three-mirror imaging system is designed, in which the secondary mirror is convex spheric mirror, the primary mirror and the third mirror are concave conicoid and coplanar, and all the three mirrors are coaxial. The design result indicates that the imaging quality of the designed system approaches the diffraction limit at full FOV in the required wave band.


Fan Y.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fan Y.-Y.,University of Chinese Academy of Sciences | Fan Y.-Y.,Huaiyin Institute of Technology | Shen X.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sang Y.-J.,Huaiyin Institute of Technology
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

A no reference image sharpness assessment method based on the property of Contrast Sensitivity Function(CSF) was proposed to realize the sharpness assessment of optical measurement equipment without reference television images. Firstly, a reference image for an original was constructed by a low-pass filter and both images were performed the Discrete Cosine Transform(DCT), and intermediate frequency coefficients and high frequency coefficients are divided into two parts respectively to be performed the Inverse DCT(IDCT) to obtain sub-images. Then, the Structural Similarity(SSIM) of corresponding sub-images was calculated. Finally, the image sharpness is obtained through the weighted sum of sub-image structural similarities. The experiment results show that the proposed method can obtain the Pearson Correlation Coefficient(CC) in 0.9152, Spearman Rank Order Correlation Coefficient CC(SROCC) in 0.9079 and out Rate (OR) in 0.0345, which shows very high accuracy, monotonicity and consistency for the Gaussian blur image. The smallest defocus image can be quickly and accurately identified in the sequence defocus images and the effect is better than those of other four traditional focus evaluation functions. For different types of television blur images, the assessment results is more accord with human visual characteristics. It can be applied to optical measurement equipment television system and give accurate and reliable sharpness assessment of no reference television image.


Xu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Xu W.,University of Chinese Academy of Sciences | Huang W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yang W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

To meet the stringent overlay requirements, it is desirable to select appropriate elements to compensate and adjust the magnification of the projection lithographic lens with double telecentricity. A simple and practical method to tolerance the magnification is presented. This method uses the commercial optical design software and the finite difference algorithm to calculate the magnification sensitivity for some tolerances, and then selects the optimal magnification compensator with the consideration of the wave aberration sensitivity. By using this method, the magnification tolerance is analysed and the magnification compensator is selected for a projection lens with the working wavelength of 193 nm and numerical operture of 0.75. The results show that the lens achieves 50×10-6 magnification adjustment, and the root-mean-square degradation of lens wavefront aberration is less than 1.5 nm.


He B.-G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | He B.-G.,University of Chinese Academy of Sciences | Zhu M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

In image matching process, the affine transformation is difficult to avoid. In exiting algorithms, Scale Invarian Feature Transform(SIFT) has strong resistance to changes of scale, rotation, translation and illumination changes generated by affine transformation. However, when an image has a view angle change, especially large change, the SIFT is not satisfactory. This paper researches the principle of the SIFT and improves its matching function. The latitude and longitude of camera axis are simulated firstly, and then the images are matched by using the improved SIFT algorithm. Experiments show that the algorithm not only retains the original advantages of the SIFT algorithm, but also been robust to changes of the angle. It has achieved a complete anti-affine transformation. In conclusions, the proposed algorithm is more suitable to affine transformation, especially large angle changes, as compared with SIFT algorithm.


Wang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang L.,University of Chinese Academy of Sciences | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Su Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Shen D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Nanoscale Research Letters | Year: 2012

Poly[2-methoxy-5-(2-ethylhexyloxy-p-phenylenevinylene)]/ZnO nanorod hybrid solar cells consisting of PbS quantum dots [QDs] prepared by a chemical bath deposition method were fabricated. An optimum coating of the QDs on the ZnO nanorods could strongly improve the performance of the solar cells. A maximum power conversion efficiency of 0.42% was achieved for the PbS QDs' sensitive solar cell coated by 4 cycles, which was increased almost five times compared with the solar cell without using PbS QDs. The improved efficiency is attributed to the cascade structure formed by the PbS QD coating, which results in enhanced open-circuit voltage and exciton dissociation efficiency. © 2012 Wang et al.


Wang F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang F.,University of Chinese Academy of Sciences | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guo Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Nanoscale | Year: 2013

Artificial leaf structures have been fabricated by the self-assembly of ZnO nanoparticles. A hydrothermal method was used to synthesize the nanoparticles. The self-assembly patterns showed asymmetric dendritic morphologies, larger surface-to-volume ratios, a broad absorption band and high resistance. A non-equilibrium two-stage-formation process included diffusion limited aggregation, and the phase-field model was introduced to explain the formation mechanism of the pattern. A high-performance ultraviolet detector was fabricated on the artificial leaf structures, which showed that the current under the irradiation of a UV lamp (1.21 mW cm-2) was about 104 times greater than in the dark. The various and functional properties of the pattern show us the vast prospects of potential applications for light harvesting systems and other optical-electric devices. © The Royal Society of Chemistry 2013.


Jiang M.-M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen H.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen H.-Y.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Shen D.-Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Physical Chemistry Chemical Physics | Year: 2014

Hybrid plasmonic waveguides have achieved rapid advancement in plasmonics, which has given rise to remarkable field enhancement, light harvest, light-transport capabilities, bridging the gap between electronics and photonics by routing and manipulating light at sub-wavelength regions and so on. However, the development of plasmonic waveguides is hindered by lack of devices that can adjust coherent plasmonic fields. In this letter, hybridized planar multilayer insulator metal insulator metal insulator heterostructures are proposed, and it is demonstrated that their unique capabilities can be used to adjust the mode characteristics by means of varying the thickness of the insulator spacer layer inserted between two metal films, such as the shift of the surface plasmon resonance wavelength. This type of hybrid plasmonic waveguides opens up opportunities for the tunability of mode characteristics, adjustment of resonant energy transfer processes, that have a potential for designing novel optical micro/nano resonance cavities. This journal is © the Partner Organisations 2014.


Deng Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Korvink J.G.,Institute of Microstructure Technology
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences | Year: 2016

This paper develops a topology optimization procedure for three-dimensional electromagnetic waves with an edge element-based finite-element method. In contrast to the two-dimensional case, three-dimensional electromagnetic waves must include an additional divergence-free condition for the field variables. The edge element-based finiteelement method is used to both discretize the wave equations and enforce the divergence-free condition. For wave propagation described in terms of the magnetic field in the widely used class of nonmagnetic materials, the divergence-free condition is imposed on the magnetic field. This naturally leads to a nodal topology optimization method. When wave propagation is described using the electric field, the divergence-free condition must be imposed on the electric displacement. In this case, the material in the design domain is assumed to be piecewise homogeneous to impose the divergencefree condition on the electric field. This results in an element-wise topology optimization algorithm. The topology optimization problems are regularized using a Helmholtz filter and a threshold projection method and are analysed using a continuous adjoint method. In order to ensure the applicability of the filter in the element-wise topology optimization version, a regularization method is presented to project the nodal into an element-wise physical density variable. © 2016 The Author(s) Published by the Royal Society. All rights reserved.


Yang L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yang L.,University of Chinese Academy of Sciences | Li G.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Proceedings - 2013 International Conference on Computer Sciences and Applications, CSA 2013 | Year: 2013

One method was proposed in this paper which can update observed data sparsely and reconstruct the scene model densely so that the monocular vision system can observe and reconstruct the target dynamically. On one hand, by combining the classic solutions for observation systems and introducing the coher-ence-detection and the maintenance-judgment into it, sparse updating and optimization was fulfilled. On the other hand, by introducing adaptive constrain on scattered points into dense reconstruction phase so that the degree of reconstruction-fault tolerance was promoted. Meanwhile, by using a hybrid modeling approach and introducing the gradient-motion model, the interface of the scene was optimized. The experiment result shows that the efficiency of the system can be ensured by separation of reconstruction and observation, the system can basically satisfy the requirement of online analysis on dynamic scene. © 2013 IEEE.


Liu X.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.-Y.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang S.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Nanoscale | Year: 2013

Zinc oxide (ZnO) nanocolumns have been prepared by a metal-organic chemical vapor deposition technique, and structural and optical characterization reveal that the nanocolumns have high crystalline and luminescent qualities. Au/MgO/ZnO/In structured Schottky diodes have been fabricated from the nanocolumns. An intense emission can be detected from the diodes under the drive of bias voltage, and the output power can reach 3.7 μW. The intense emission comes from both the high crystalline and luminescent qualities of the ZnO nanocolumns, and the ideal Schottky contact formed in the Au/MgO/ZnO/In structures. © 2013 The Royal Society of Chemistry.


Sun X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sun X.,University of Chinese Academy of Sciences | Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Jiang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Applied Physics Letters | Year: 2011

GaN metal-semiconductor-metal (MSM) ultraviolet detectors were investigated by depositing different density of SiO2 nanoparticles (SNPs) on the GaN. It was shown that the dark current of the detectors with SNPs was more than one order of magnitude lower than that without SNPs and the peak responsivity was enhanced after deposition of the SNPs. Atomic force microscopy observations indicated that the SNPs usually formed at the termination of screw and mixed dislocations, and further current-voltage measurements showed that the leakage of the Schottky contact for the GaN MSM detector decreased with deposited the SNPs. Moreover, the leakage obeyed the Frenkel-Poole emission model, which meant that the mechanism for improving the performance is the SNPs passivation of the dislocations followed by the reduction in the dark current. © 2011 American Institute of Physics.


Wu S.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu S.-H.,University of Chinese Academy of Sciences | Li W.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chu B.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Applied Physics Letters | Year: 2011

We demonstrate a photodetector (PD) with broad spectral response by taking the advantages of more flexible device design in using small molecule materials. The optimized device shows an external quantum efficiency of over 20 from 200 to 900 nm. The high performance is achieved by jointing two donor (D)/acceptor (A) hetero-junctions [m-MTDATA(D)/TiOPc(A) and TiOPc(D)/F16CuPc: PTCDI-C8(A)] such that photoresponses over the deep-ultraviolet (UV) and visible-near infrared regions can be independently optimized. By choosing D- and A-materials with matched energy level alignment, high carrier mobility, and balanced carrier transporting properties, the present PD shows a fast response of 56 ns. The high speed and deep-UV sensitivity might lead to potential military applications such as missile tracking in addition to optical communications, chemical/biological sensing etc. © 2011 American Institute of Physics.


Liao Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liao Y.,University of Chinese Academy of Sciences | Lu Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fan Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Physics Letters | Year: 2011

Thin films of manganese-doped indium oxide (IMO) deposited by electron beam evaporation have been investigated as anodes in organic light-emitting diodes (OLEDs). The IMO films have a high work function of 5.35 eV, a desirable surface morphology with an average roughness of 1.1 nm, a high average optical transmittance of 87.2 in the visible region, and a maximum optical transmittance of 92 at 460 nm. It is demonstrated that an IMO anode can effectively improve hole injection at the anode/organic interface, resulting in OLEDs with an increased electroluminescent efficiency. © 2011 American Institute of Physics.


Zhu H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhu H.,University of Chinese Academy of Sciences | Shan C.X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li B.H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 3 more authors.
Applied Physics Letters | Year: 2011

By proper controlling the carrier generation and multiplication processes, an Au/MgO/Mg0.52Zn0.48O/MgxZn 1-xO/n-ZnO structure has been designed and fabricated. In this structure, holes are multiplied via an impact ionization process in the MgO layer and injected into the Mg0.52Zn0.48O layer, and electrons are injected into the Mg0.52Zn0.48O layer from the n-ZnO layer through a composition-gradient MgxZn1-xO bridging layer. With the injection of electrons and holes, a deep ultraviolet emission at around 276 nm, coming from the Mg0.52Zn0.48O active layer, has been observed. The results reported in this letter may provide a promising route to high performance deep ultraviolet light-emitting devices. © 2011 American Institute of Physics.


Yue D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Yue D.,University of Chinese Academy of Sciences | Xu S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Nie H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Optics | Year: 2015

The conventional Broyden-Fletcher-Goldfarb-Shanno (BFGS) method used to solve the cost function of a phase diversity (PD) algorithm converges to a global optimum only when the cost function is convex. We present a modified BFGS method, which has fine global convergences for both convex and nonconvex functions, guarantees that the solutions will converge to the global minimum, corresponding to the actual wavefront coefficients, and apply it to minimize the PD cost function to co-phase the segmented active optics system and recover the unknown object under different noise levels. The noise amplification effect on the accuracy of the algorithm is removed by our proposed estimated strategy of the regularization parameter for the PD problem. The vast contrast results demonstrate that the modified method has a much higher accuracy than the conventional BFGS method for the nonconvex condition even under a considerably high noise level. © 2015 Optical Society of America.


Sun Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chang S.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chang S.,University of Chinese Academy of Sciences | Zhu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Optics | Year: 2015

Infrared radiometric measurements can acquire important data for missile defense systems. When observation is carried out by ground-based infrared systems, a missile is characterized by long distance, small size, and large variation of radiance. Therefore, the infrared systems should be manufactured with a larger aperture to enhance detection ability and calibrated at a broader dynamic range to extend measurable radiance. Nevertheless, the frequently used calibration methods demand an extended-area blackbody with broad dynamic range or a huge collimator for filling the system's field stop, which would greatly increase manufacturing costs and difficulties. To overcome this restriction, a calibration method based on amendment of inner and outer calibration is proposed. First, the principles and procedures of this method are introduced. Then, a shifting strategy of infrared systems for measuring targets with large fluctuations of infrared radiance is put forward. Finally, several experiments are performed on a shortwave infrared system with Φ400 mm aperture. The results indicate that the proposed method cannot only ensure accuracy of calibration but have the advantage of low cost, low power, and high motility. Hence, it is an effective radiometric calibration method in the outfield. © 2015 Optical Society of America.


Xu W.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Piao Y.,University of Chinese Academy of Sciences
2010 2nd International Conference on Computational Intelligence and Natural Computing, CINC 2010 | Year: 2010

Anti-radiation TSC695F is usually used as aerospace payload controller in tasks to ensure the aerospace payload having extremely high reliability in abominable space environment. The processor bases on SP ARC V7 architecture with parity check and EDAC, so it could design out high reliable bootstrap loader to guarantee the operation system of VxWorks and application codes loaded correctly and worked stable and high effective. First, this paper put forward the system hardware composition and boot mode which apply for aerospace payload, then it makes clear the related contents of register group initialization, stack initialization, system hardware initialization in bootstrap loader of TSC695F and give out the method to establish TRAP table. That's all through comparing different type of organize mode of program image. After that, compiling of target codes have been described and the kernel code of MakeFile had been given at the same time for reference aimed at the realization of engineering. Although this paper is based on TSC695F, but it could be extended to other embedded system based on SP ARC for bootstrap loader analysis and design, for example, the TSC697 which based on SP ARC V8 with higher performance, so this paper has extremely high engineering value. ©2010 IEEE.


Liu D.,CAS Changchun Institute of Applied Chemistry | Liu D.,University of Chinese Academy of Sciences | Zhang X.,CAS Changchun Institute of Applied Chemistry | Zhang X.,University of Chinese Academy of Sciences | And 2 more authors.
Nanoscale | Year: 2013

Free-standing nitrogen-doped carbon nanofiber (NCNF) films based on polyacrylonitrile (PAN) were prepared simply by the combination of electrospinning and thermal treatment. We reused the nitrogen-rich gas generated as the byproduct of PAN at elevated temperature, mainly NH3, for surface etching and nitrogen doping. The as-obtained NCNFs exhibited a rougher surface and smaller diameter than pristine carbon nanofibers. Despite the decreased total N content, a significant increase in the content of pyrrolic-N was observed for the NCNFs. In application to electrochemistry, the free-standing NCNF films showed comparable catalytic activity with a close four-electron pathway to a commercial Pt/C catalyst in alkaline medium toward oxygen reduction reaction (ORR), which can be attributed to the nitrogen doping and high hydrophilicity. More importantly, the ORR current density on the NCNFs only dropped 6.6% after 10000 s of continuous operation, suggesting an enhanced long-time durability. In addition, the NCNFs also showed better electrocatalytic selectivity than Pt/C. Our work reveals a facile but efficient approach for the synthesis of free-standing NCNF films as a promising alternative to Pt-based electrocatalysts in fuel cells. © The Royal Society of Chemistry 2013.


Liu J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu J.,University of Chinese Academy of Sciences | Li F.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Ultrasonics | Year: 2013

In this paper, the group velocities of the zero order antisymmetric (A0) Lamb modes in a phononic crystal plate with single layer cylindrical holes parallel to the surface of the plate were investigated theoretically. The results show that by increasing the filling fraction, the A0 mode can be efficiently slowed down and the group velocity of the A0 modes can be tuned from the positive to the negative referring to the phase velocity. Moreover, the zero group velocity of the A0 modes can be obtained with a given filling fraction. These results may be useful in designing acoustic devices. © 2012 Elsevier B.V. All rights reserved.


Li J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li J.,University of Chinese Academy of Sciences | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

An efficient near infrared (NIR) quantum cutting in CaSc2O 4: Tm3+/Yb3+ phosphor has been demonstrated by the visible and NIR spectra properties as well as the decay curves of Tm 3+:1G4 level. Upon excitation of Tm 3+:1G4 level with a blue photon at 466 nm, Yb3+:2F5/2 level can emit two NIR photons around 1000 nm through cooperative energy transfer (ET) from Tm3+ to Yb3+ with the maximum energy transfer efficiency is 71%, and highest theoretical quantum efficiency reaches 171%, close to the limit of 200%. Because the energy of Yb3+ transition is matched well with band gap of crystalline silicon, the excellent downconversion luminescence property indicates that CaSc2O4:Tm3+/Yb3+ is a promising oxide material for increasing the conversion efficiency of crystalline silicon solar cells. © 2013 Elsevier Ltd. All rights reserved.


Dong X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Dong X.,University of Chinese Academy of Sciences | Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

A series of Eu3+ ions doped Sr9Sc(PO 4)7 orange-red emitting phosphors have been prepared by solid-state reaction method. Photoluminescence properties under near-ultraviolet (NUV) light excitation of the samples have been carried out. The studies show that the samples can be effectively excited by NUV (394 nm) which matches to the output wavelengths of near UV chips and exhibits intense orange-red emissions. Eu3+ concentration was found to be optimum at x = 0.4 and the thermal quenching temperature of Sr9Sc(PO4)7:0. 4Eu3+ is above 200 °C. Thus, the intense orange red emitting phosphor could be a promising phosphor candidate in generating white light combined with the NUV chip. © 2013 Elsevier B.V. All rights reserved.


Qiao Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Qiao Q.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zheng J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 5 more authors.
Journal of Materials Chemistry | Year: 2012

In this paper, localized surface plasmon enhanced n-ZnO/i-ZnO/MgO/p-GaN structured light-emitting devices have been designed and constructed. It is found that the electroluminescence of the devices can be enhanced at selective wavelengths that match the localized surface plasmon extinction spectra of the metal nanoparticles. © 2012 The Royal Society of Chemistry.


Zhang Z.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang Z.,University of Chinese Academy of Sciences | Wu Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Langmuir | Year: 2010

Colloidal Au nanoparticles (AuNPs) with a diameter of 17 nm were prepared by the reduction of HAuCl4 with citrate trisodium. The addition of NaBH4 to the prepared citrate-stabilized AuNP solutions not only induced a blue shift in the surface plasmon resonance peak (λ max) because of the increased number of electrons in the NPs injected by NaBH4 but also affected the stability of citrate adsorbed on AuNPs. The zeta potential of AuNPs after the addition of 6mMNaBH4 decreased (67%) but was restored (88%) after the discharge of the injected electrons. The effect of NaBH4 treatment on the stability of citrate ions on AuNPs was investigated by X-ray photoelectron spectroscopy (XPS). The XPS data showed that citrate ions partially desorbed from the surfaces of AuNPs (67%) after NaBH4 treatment but readsorbed onto the AuNPs (80%) after the discharge of the NPs; this result agrees well with the zeta potential data. The partial removal of citrate ions from AuNPs results in an anisotropic charge distribution around the AuNPs. By increasing the amount of NaBH4 and the electrolyte concentration of the solution, non-close-packed aggregates of AuNPs can be formed, from monomers to small aggregates containing a few AuNPs and 3D network aggregates. © 2010 American Chemical Society.


Gong D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Gong D.,University of Chinese Academy of Sciences | Tian T.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2010

A computer-aided alignment method in combining with the interferometry was proposed to optimize the detection and alignment of an off-axis three-mirror system. By using a multi-fields ZYGO interferometer, a series of Zernike coefficients were obtained to express the incorrect parameters of the system, which were then transformed into geometric aberrations as the corrected objects based on the dependence of Zernike-coefficients on Seidel aberrations. Furthermore, an optical design software was used to derive the sensitivity matrix related to the incorrect parameters and to determine the incorrect parameter mostly sensitive to the redual aberration. Consequently, the adjusted result was brought into the software to verify the selection of incorrect parameters. Experimental results show that the RMS value of the system is lower than 0.04λ after iterations, which proves the effectiveness of the method in alignment guidance.


Liu K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu K.,University of Chinese Academy of Sciences | Liu K.,University of Amsterdam | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 10 more authors.
ACS Nano | Year: 2012

A highly efficient multifunctional nanoplatform for simultaneous upconversion luminescence (UCL) imaging and photodynamic therapy has been developed on the basis of selective energy transfer from multicolor luminescent NaYF 4:Yb 3+,Er 3+ upconversion nanoparticles (UCNPs) to photosensitizers (PS). Different from popular approaches based on electrostatic or hydrophobic interactions, over 100 photosensitizing molecules were covalently bonded to every 20 nm UCNP, which significantly strengthened the UCNP-PS linkage and reduced the probability of leakage/desorption of the PS. Over 80% UCL was transferred to PS, and the singlet oxygen production was readily detected by its feature emission at 1270 nm. Tests performed on JAR choriocarcinoma and NIH 3T3 fibroblast cells verified the efficient endocytosis and photodynamic effect of the nanoplatform with 980 nm irradiation specific to JAR cancer cells. Our work highlights the promise of using UCNPs for potential image-guided cancer photodynamic therapy. © 2012 American Chemical Society.


Guo L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Guo L.,University of Chinese Academy of Sciences | Zhang H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhao D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2012

ZnO nanowires UV photodetectors with different interdigital electrode distances were fabricated by using a dielectrophoresis method in this work. The multiple horizontal nanowires array integrated that photodetectors were composed by lots of paralleled ZnO nanowires. Experimental results showed the responsivity of the detector with the electrode distance of 6.5 μm could reach 40 A/W at 10 V bias. It was also observed that the rising and decaying stages of the time-resolve photocurrent were both two processes, which was possibly attributed to the relaxation processes of the surface states and the deep level traps. © 2011 Elsevier B.V. All rights reserved.


Ma D.-M.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen T.-Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Chen T.-Q.,University of Chinese Academy of Sciences
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2010

A testing method was proposed for the diffraction wavefront produced by a pinhole mounted in a point-diffraction interferometer. The producing principle of the point diffraction wavefront was presented, and the relation among the pinhole states, illumination adjustment and the wavefront aberration was analyzed. On the basis of the fundamental theory of information optics, the Fourier transform and an iterative algorithm were used to calculate and analyze the pinhole diffuse image, retrieve the phase of diffraction wavefront and then to obtain the wavefront information. The related theory was discussed and the measured point diffraction image was analyzed through a computing software of phase retrieval. Results indicate that the output phase tends to a convergence after about 15 iterations, and the image error factor has dropped to 0.12. The testing method has been applied to the selection of pinholes and the assembly of pinhole illumination systems, and experimental results prove that the testing method is valid.


Wang N.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang N.,University of Chinese Academy of Sciences | Liu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Advanced Materials | Year: 2010

Figure Presented A novel n-type transparent conducting oxide, an LaTiO 3-doped indium oxide (ILTO) film, has been developed by double electron beam evaporation associated with an End Hall ion-assisted deposition technique. ILTO shows room-temperature UV photoluminescence (∼386 nm) and a thermally stable highly effective WF (∼5.2eV) properties. ILTO is applied to replace traditional indium tin oxide and demonstrates positive effects on organic optoelectronics. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.


Liu X.-Y.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Liu X.-Y.,University of Chinese Academy of Sciences | Shan C.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Wang S.-P.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 2 more authors.
Nanoscale | Year: 2012

Vertically aligned ZnO nanowires have been prepared, and structural characterization shows that the nanowires have relatively high crystalline quality. The dominant free exciton emission and the appearance of B-type exciton emissions at low temperatures reveal the high optical quality of the nanowires. Au-MgO-ZnO nanowire structures have been constructed, and random lasing has been observed from the structure under the injection of continuous current. © 2012 The Royal Society of Chemistry.


Zhang J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang J.,University of Chinese Academy of Sciences | Peng H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Fu X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | And 4 more authors.
Optics Express | Year: 2013

An external cavity structure based on the -1st transmission grating is introduced to spectral beam combining a 970 nm diode laser bar. A CW output power of 50.8 W, an electro-optical conversion efficiency of 45%, a spectral beam combining efficiency of 90.2% and a holistic M2 value of 10.9 are achieved. This shows a way for a diode laser source with several KW power and diffraction-limited beam quality at the same time. © 2013 Optical Society of America OCIS codes: (140.2010) Diode laser arrays; (140.3298) Laser beam combining; (050.1950) Diffraction gratings.


Sun J.,University of Tsukuba | Sun J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sun J.,University of Chinese Academy of Sciences | Zhao J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Masumoto Y.,University of Tsukuba
Applied Physics Letters | Year: 2013

We demonstrate the electron transfer (ET) processes from CuInS 2/ZnS core/shell quantum dots (QDs) into porous anatase TiO 2 films by time-resolved photoluminescence spectroscopy. The rate and efficiency of ET can be controlled by changing the core diameter and the shell thickness. It is found that the ET rates decrease exponentially at the decay constants of 1.1 and 1.4 nm-1 with increasing ZnS shell thickness for core diameters of 2.5 and 4.0 nm, respectively, in agreement with the electron tunneling model. This shows that optimized ET efficiency and QD stability can be realized by controlling the shell thickness. © 2013 American Institute of Physics.


Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sun X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Sun X.,University of Chinese Academy of Sciences | Song H.,CAS Changchun