CAS Anhui Institute of Optics and Fine Mechanics

Hefei, China

CAS Anhui Institute of Optics and Fine Mechanics

Hefei, China

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Zhou F.,CAS Institute of Physics | Liu Y.,CAS Anhui Institute of Optics and Fine Mechanics | Li Z.-Y.,CAS Institute of Physics
Optics Letters | Year: 2011

We investigate the surface plasmon polariton (SPP)-assisted interaction between two dipoles near a metal surface. The radiation energy from a dipole can excite SPPs and transport to another dipole through the channel of the localized SPP modes. This energy transfer can be much more efficient than direct energy transfer via dipole-dipole radiation interaction in free space. A simple analytical model is proposed to describe the underlying physics behind the influence of SPP on the dipole-dipole interaction energy, and it predicts a wide variety of complicated interaction features that agree well with rigorous calculations. © 2011 Optical Society of America.


Rao R.,CAS Anhui Institute of Optics and Fine Mechanics
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

The physical quantity describing atmospheric effect on vision is visibility. The definitions of visibility have been diverse in different application areas and scientific literatures. Horizontal visibility was measured routinely in meteorology. There has been no standard visibility definition for slant path vision which is frequently occurred in such areas as aeronautics. Based on the radiance contract between object and atmospheric background the problem on vision through atmosphere is discussed. Definition of horizontal visibility has been clarified. The slant path visibility has been solved based on the radiative transfer equation. The general characteristics of the slant path visibility under model atmosphere are presented, and emphasis is paid on the difference between up-looking and down-looking visibility.


Rao R.,CAS Anhui Institute of Optics and Fine Mechanics
Chinese Optics Letters | Year: 2012

The equivalence of the modulation transfer function (MTF) of a turbid medium and the transmitted radiance from the medium under isotropic diffuse illumination is demonstrated. MTF of a turbid medium can be fully evaluated by numerically solving a radiative transfer problem in a plane parallel medium. MTF for a homogenous single layer turbid medium is investigated as illustration. General features of the MTF in the low and high spatial frequency domains are provided through their dependence on optical thickness, single scattering albedo, asymmetrical factor, and phase function type. © 2012 Chinese Optics Letters.


Liu Y.,CAS Anhui Institute of Optics and Fine Mechanics | Zhou F.,CAS Hefei Institutes of Physical Science | Mao Q.,CAS Anhui Institute of Optics and Fine Mechanics
Optics Express | Year: 2013

In this article, an analytical theory to describe the nonlinear dynamic response characteristics of a typical SPP waveguide-cavity structure formed by a Kerr-type standing-wave cavity side-coupling to a metal-insulator-metal (MIM) waveguide is proposed by combining the temporal coupled mode theory and the Kerr nonlinearity.With the analytical theory, the optical bistability with the hysteresis behavior is successfully predicted, and the optical bistability evolutions and its dynamic physical mechanism are also phenomenologically analyzed. Moreover, the influence of the quality factors Q0 and Q1 on the first-turnning point (FTP) power of optical bistability and the bistable region width, the approaches to decrease the FTP power and to broaden the bistable region are also discussed in detail with our analytical theory. This work can help us understand the physical mechanism of the nonlinear dynamical response at nanoscale, and may be useful to design nonlinear nanophotonic systems for applications in ultra-compact all-optical devices and storages. © 2013 Optical Society of America.


Rao R.,CAS Anhui Institute of Optics and Fine Mechanics
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

Based on the equivalence of the modulation transfer function (MTF) of a plane parallel turbid medium and the emergent light intensity distribution from the medium under isotropic diffuse illumination, the MTF of some typical turbid media is fully evaluated through numerical solution with a radiation transfer code DISORT. General MTF characteristics in the whole spatial frequency range are obtained. It is found that the MTF behavior depends not only on the scattering and absorption optical thickness of the medium but also on the scattering phase function. General features of the dependence of MTF on the optical thickness, the scattering phase function, the single scattering albedo, and the asymmetric factor are presented.


Chen Dr. X.,University of Michigan | Chen Dr. X.,CAS Anhui Institute of Optics and Fine Mechanics | Huang X.,University of Michigan | Loeb N.G.,NASA | Wei H.,CAS Anhui Institute of Optics and Fine Mechanics
Journal of Climate | Year: 2013

The far-IR spectrum plays an important role in the earth's radiation budget and remote sensing. The authors compare the near-global (808S-808N) outgoing clear-sky far-IR flux inferred from the collocated Atmospheric Infrared Sounder (AIRS) and Clouds and the Earth's Radiant Energy System (CERES) observations in 2004 with the counterparts computed from reanalysis datasets subsampled along the same satellite trajectories. The threemost recent reanalyses are examined: theECMWF InterimRe-Analysis (ERA-Interim), NASAModern-Era Retrospective Analysis for Research and Application (MERRA), and NOAA/NCEP Climate Forecast System Reanalysis (CFSR). Following a previous study by X. Huang et al., clear-sky spectral angular distribution models (ADMs) are developed for five of the CERES land surface scene types as well as for the extratropical oceans. The outgoing longwave radiation (OLR) directly estimated from the AIRS radiances using the authors' algorithm agrees well with the OLR in the collocated CERES Single Satellite Footprint (SSF) dataset. The daytime difference is 0.96 ±2.02 W m-2, and the nighttime difference is 0.86 ±1.61 W m-2. To a large extent, the far-IR flux derived in this way agreeswith those directly computed from three reanalyses. The near-global averaged differences between reanalyses and observationstend to be slightly positive (0.66%-1.15%) over 0-400 cm-1 and slightly negative (20.89% to 20.44%) over 400-600 cm-1. For all threereanalyses, the spatial distributions of suchdifferences show the largest discrepancies over the high-elevation areas during the daytime but not during the nighttime, suggesting discrepancies in the diurnal variation of such areas among different datasets. The composite differences with respect to temperature or precipitable water suggest largediscrepancies for cold and humid scenes. © 2013 American Meteorological Society.


Zhou F.,CAS Hefei Institutes of Physical Science | Liu Y.,CAS Anhui Institute of Optics and Fine Mechanics | Cai W.,CAS Hefei Institutes of Physical Science
Optics Express | Year: 2013

In this article, a novel method of holographic imaging with Au nanoantenna array is presented. In order to obtain the plasmonic holographic plate for a preset letter "NANO", the phase distribution of the hologram is firstly generated by the weighted Gerchberg-Saxton (GSW) algorithm, and then 16 kinds of V-shaped nanoantennas with different geometric parameters are designed to evenly cover the phase shift of 0 to 2π by finite-difference time-domain (FDTD) method. Through orienting these nanoantennas according to the phase distribution of the hologram, the plasmonic array hologram is obtained. Very good imaging quality is observed with our nanoantenna array hologram plate. This method can be used for holographic imaging of arbitrary shape, and may find potential applications in holographic memory, printing and holographic display. © 2013 Optical Society of America.


Cao J.,CAS Anhui Institute of Optics and Fine Mechanics | Cao J.,Anhui University of Science and Technology | Mao Q.,CAS Anhui Institute of Optics and Fine Mechanics | Shi L.,Anhui University of Science and Technology | Qian Y.,Anhui University of Science and Technology
Journal of Materials Chemistry | Year: 2011

In this work, we present a novel concept of structural design for the synthesis of a new type of core/shell structure comprising γ-MnO 2 cores inside hollow α-MnO2 shells. The approach involves two main steps. First, MnCO3 microellipsoids were mixed directly with KMnO4 solution, which lead to a manganese oxide shell on the surface of the MnCO3. Then, thermal annealing of this type of core/shell structure resulted in the formation of γ-MnO 2/α-MnO2 ellipsoids, accompanying with the phase transition in both the core and shell. The as-prepared γ-MnO 2/α-MnO2 ellipsoids were used as adsorbent in water treatment, and showed an excellent ability to remove organic pollutants and heavy metal ions without any other additives. © 2011 The Royal Society of Chemistry.


Shi D.,CAS Anhui Institute of Optics and Fine Mechanics | Hu S.,CAS Anhui Institute of Optics and Fine Mechanics | Wang Y.,CAS Anhui Institute of Optics and Fine Mechanics
Optics Letters | Year: 2014

For conventional ghost imaging (GI) systems, the object image is obtained based on the reflective or transmissive character of the object. When the object and its background have the same reflectivity or transmittance, conventional GI is helpless in detecting the object from the background. An improvement is to use the polarization components of the reflected or transmitted light. We propose a polarimetric GI system that employs a polarization state generator and a polarization state analyzer. This feature allows for the first time, to the best of our knowledge, imaging the object buried in the same reflectivity or transmittance background, which represents a breakthrough for GI applications. Using a combination of intensity and polarization information, we are better able to distinguish between the background and the different material objects. © 2014 Optical Society of America.


Zhou F.,CAS Hefei Institutes of Physical Science | Liu Y.,CAS Anhui Institute of Optics and Fine Mechanics | Cai W.,CAS Hefei Institutes of Physical Science
Optics Letters | Year: 2014

In this Letter, a novel hybrid nanoparticle array with huge local electric field intensity enhancement is proposed theoretically. The hybrid array is constructed by replacing some nanodisks with nanobowties from a perfect nano-disk square array. In our structure, the nanodisk array, which acts as a two-dimensional grating, can efficiently excite surface plasmon polaritons (SPPs) modes, whose electric field is much larger than the incident light. Then the SPPs mode excites the localized surface plasmon resonance (LSPR) mode of the nanobowties. When the resonant peaks of the array and the nanobowties coincide, the nanobowties are strongly excited, and the maximum intensity enhancement factor (E/E0)2 as large as 4.2 × 106 is achieved. A two-step excitation model is proposed to help us to understand the underlying physical mechanism for this enhancement. This hybrid array structure shows great potential in highly sensitive surface enhanced Raman scattering and fluorescence detection. © 2014 Optical Society of America.

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