Key Laboratory of Opto Electronic Information Science and Technology

Tianjin, China

Key Laboratory of Opto Electronic Information Science and Technology

Tianjin, China
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Hu Z.,Nankai University | Hu Z.,Key Laboratory of Photo Electronic Thin Film Devices and Technology | Hu Z.,Key Laboratory of Opto Electronic Information Science and Technology | Zhang J.,Nankai University | And 8 more authors.
Solar Energy Materials and Solar Cells | Year: 2012

We demonstrate the use of dip coating technology as a fabrication tool for highly efficient polymer solar cells. We investigate the critical parameters for dip coating deposition of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C 61-butyric acid methyl ester (PCBM) to obtain optimized active layers. These parameters include the selection of organic solvent, solution concentration and room temperature. Structure and morphology of dip coated films are characterized via X-ray diffraction, UVvisible absorption spectra and atomic force microscopy. We achieve dip coated devices with power conversion efficiency of 3.93%, with fill factor, short circuit current and open circuit voltage of 0.63, 10.62 mA cm -2 and 0.60 V, respectively, even though the devices were fabricated in air without any annealing treatment. © 2011 Elsevier B.V. All rights reserved.


Han Q.,Tianjin University | Han Q.,Key Laboratory of Opto Electronic Information Science and Technology | Ning J.,Tianjin University | Ning J.,Key Laboratory of Opto Electronic Information Science and Technology | Sheng Z.,Tianjin University of Technology and Education
IEEE Journal of Quantum Electronics | Year: 2010

The influence of the amplified spontaneous emission (ASE) on the performance of high-power, cladding-pumped Er-Yb codoped fiber amplifiers (EYDFAs) are investigated numerically. The results show that the counter-pump-propagating Yb-band ASE is the main reason that limits the efficiency of an EYDFA at high pump power. By introducing a co-pumppropagating Yb-band signal at proper wavelength, the counterpump- propagating Yb-band ASE can be effectively suppressed and thus the available power of the EYDFA can be remarkably improved. This method is also helpful to improve the stability of high power EYDFAs. © 2010 IEEE.


Gu C.,Tianjin University | Gu C.,Key Laboratory of Opto electronic Information Science and Technology | Cheng Y.,Tianjin University | Cheng Y.,Key Laboratory of Opto electronic Information Science and Technology | And 4 more authors.
Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2015 | Year: 2015

A fractal design of superconducting nanowires integrated with nano-antennae is proposed to achieve polarization-insensitive single-photon detection. The simulated absorptance at 1550 nm for TE and TM polarizations are 80.1% and 80.3%, respectively. © 2015 OSA.


Zhu X.,Tianjin University | Zhu X.,Key Laboratory of Opto electronic Information Science and Technology | Gu C.,Tianjin University | Gu C.,Key Laboratory of Opto electronic Information Science and Technology | And 4 more authors.
2015 Opto-Electronics and Communications Conference, OECC 2015 | Year: 2015

We report on our design and simulation of superconducting single-photon detectors, based on ultra-narrow nanowire (30 nm) integrated with waveguides, to achieve broadband (wavelength: 1.2 micrometer to 1.7 micrometer) absorptance >0.99 for two orthogonal polarizations. © 2015 IEEE.


Hu H.,Nankai University | Wang X.,Nankai University | Zhai H.,Key Laboratory of Opto Electronic Information Science and Technology
Journal of Physics D: Applied Physics | Year: 2011

A pump-probe technique is employed to investigate the dynamic process of femtosecond laser ablation of silica glass, and three stress waves are observed inside the silica glass in the time-resolved shadowgraphs at a fluence of 40 J cm-2. It is believed that the first stress wave is a thermoelastic wave generated by thermal expansion, while the second and the third are generated subsequently by the mechanical expansions as a result of the extremely high pressure induced by the laser. By employing digital holography, the ablation crater is investigated to identify the ablation results, and high-density silica glass is found beneath the ablation crater, which is also the result of the laser-induced pressure. Furthermore, it is found that more stress waves will be generated at a higher fluence, and the thresholds for the generation of the first, second and third stress wave are measured to be about 2 J cm-2, 6 J cm-2 and 31 J cm-2, respectively. The theoretical calculation result shows that the laser-induced pressure increases with the increase in fluence and can be on the scale of TPa, and we believe a higher pressure will induce more mechanical expansions and therefore more stress waves. © 2011 IOP Publishing Ltd.


Hu Z.,Nankai University | Hu Z.,Key Laboratory of Opto Electronic Information Science and Technology | Zhang J.,Nankai University | Zhang J.,Key Laboratory of Opto Electronic Information Science and Technology | And 4 more authors.
Organic Electronics: physics, materials, applications | Year: 2012

We have used dip coating method to fabricate polymer solar cells (PSC) with an active layer composed of a blend of poly(3-hexylthiophene) and [6,6]-phenyl-C61 butyric acid methyl ester. With optimized conditions, pinhole-free and highly self-assembly active films were obtained, resulting in a narrow distribution of the device parameter. The performance of the dip coated devices (4.03%) is comparable to that of the spin coated devices (4.00%). Moreover, we show that dip coating is a feasible technology to deposit all solution processable layers of PSC, including the hole-transporting layer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) as well and demonstrate dip coated hole-transporting layer and active layer devices with an efficiency of 3.49%. Our research may provide an alternative way for preparation of roll-to-roll processed organic electronics. © 2011 Elsevier B.V. All rights reserved.


Ge J.-J.,Nankai University | Ge J.-J.,Key Laboratory of Opto electronic Information Science and Technology | Wang Z.-Q.,Nankai University | Wang Z.-Q.,Key Laboratory of Opto electronic Information Science and Technology
Chinese Physics Letters | Year: 2011

In order to obtain the influence of the luminance at photopic level on the neural mechanism, a neural contrast sensitivity function (NCSF) measurement system is established. The contrast sensitivity function (CSF) of the visual system and the modulation transfer function (MTF) of the eye's optical system are first measured with correspondent instruments respectively. Then the NCSF is calculated as the ratio of CSF to MTF. Four individual eyes are involved in the cases of green light and white light. With increasing luminance, the tendency of the variation of the CSFs is similar to that of the NCSFs, while the gain is larger than that of the NCSFs, especially in the region of higher spatial frequency. It is the NCSF, rather than CSF, that reflects tie luminance sensitivity in the retina-brain neural system, because the influence of the eye's optical system is excluded. © 2011 Chinese Physical Society and IOP Publishing Ltd.


Zheng S.,Nankai University | Zheng S.,Key Laboratory of Opto Electronic Information Science and Technology | Liu Y.,Nankai University | Liu Y.,Key Laboratory of Opto Electronic Information Science and Technology | And 3 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

Compared with the traditional keratometer which adopts double image prism to measure the corneal refraction, a novel keratometer's optical system, based on cursor imaging principle with impact structure and convenience in use, is proposed in this paper. The optical system includes imaging system and illumination system. Imaging system, which consists of projection objective, cornea and photographic objective, adopts exterior focusing model. Illumination system adopts Kohler illumination, which realizes uniform illumination on the ring cursor, anterior corneal surface and the image plane on the CCD receptor. The image resolution can achieve 133 lp/mm, and the distortion is less than 1%. The measurement accuracy of corneal refraction reaches to 0.25 D (0.02 mm for curve radius), and the measurement range is 30-60 D (5.5-11 mm for curve radius). With high measurement accuracy and a wide range of measurement for the corneal refraction, the optical system simplifies the keratometer's structure and operation for practitioners effectively.


Kuang D.,Nankai University | Fang Z.,Key Laboratory of Opto electronic Information Science and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

For the laser spot size, the blazed diffractive grating fabricated with direct laser writing will has a slantwise lateral facet edge. To evaluate the influence of the slope of the facet edge of blazed diffractive grating, we calculate the diffraction efficiencies in +1 order and zero order as a function of the angle for the slantwise lateral facet edge with rigorous coupled wave analysis. As the lateral facet edge is getting more slantwise, the diffraction efficiency in +1 order decrease more, which degrades the image quality in monochromatic imaging. But the diffraction efficiency in zero order always keeps very low to assure the application in optical limiting. © 2010 Copyright SPIE - The International Society for Optical Engineering.


Rao F.,Nankai University | Rao F.,Key laboratory of Opto electronic Information Science and Technology | Wang Z.-Q.,Nankai University | Wang Z.-Q.,Key laboratory of Opto electronic Information Science and Technology | And 2 more authors.
Optik | Year: 2010

Customized hybrid diffractive-refractive intraocular lens (IOL) has been designed based on an individual pseudophakic eye model constructed with the measured corneal topography data and the eye's axial lengths. The detailed designing and optimizing procedure is given. It is found that an eye with achromatic customized IOL would achieve super modulation transfer function (MTF) in both the scotopic and photopic conditions. The variation of MTF as colors is negligible, the chromatic focus shift is no more than 0.1 D, and the depth of focus is 3.0 D with quite high MTF. The achromatic customized IOL provides excellent visual performance for cataract patients. Moreover, individual pseudophakic eye model can be an effective tool for evaluating the optical performance of pseudophakic eye and the influence of clinical surgery deviation. © 2008.

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