位相共轭镜支持下的无序介质的光的反射
Reflection of light from a disordered medium backed by a phase-conjugating mirror
摘要：
本文从理论上研究了光学相位共轭和多重散射的相互作用。我们计算了当相位共轭镜置于无序介质后时，其反射光的强度。我们比较了完全相位相干理论与辐射转移理论的结果。当光子在无序介质中的停留时间τ dwell远大于相位共轭镜处获得的频移2Δω的倒数时，两种方法是等价的。当τ_{dwell} Δω< 1时，相位相干性对反射光强的影响很大。特别地，当Δω小于1/τ dwell时，反射率对无序强度的依赖性出现最小值。讨论了电子在正常金属和超导体界面上的Andreev反射的相似性和不同之处。
英文摘要：
This is a theoretical study of the interplay of optical phase-conjugation and multiple scattering. We calculate the intensity of light reflected by a phase-conjugating mirror when it is placed behind a disordered medium. We compare the results of a fully phase-coherent theory with those from the theory of radiative transfer. Both methods are equivalent if the dwell time τ_{dwell} of a photon in the disordered medium is much larger than the inverse of the frequency shift 2Δωacquired at the phase-conjugating mirror. When τ_{dwell} Δω< 1, in contrast, phase coherence drastically affects the reflected intensity. In particular, a minimum in the dependence of the reflectance on the disorder strength disappears when Δωis reduced below 1/τ_{dwell}. The analogies and differences with Andreev reflection of electrons at the interface between a normal metal and a superconductor are discussed.
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