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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. Source


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. Source


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. Source


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. Source


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. Source

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