二维随机波导中倏逝波与传播通道的耦合
Coupling of evanescent waves into propagation channels within two-dimensional random waveguides
摘要：
倏逝波向传播波的转换是实现某些超分辨成像方法的关键机制。利用递归格林函数和散射矩阵理论，详细研究了倏逝波在随机介质中的传输，定量分析了倏逝信道与传播信道的耦合。通过数值计算，我们发现入射倏逝波信道的透射率由散射矩阵的本征值和随机介质中与相应信道的耦合强度共同决定，而随机介质的无序强度对这两者都有影响。
英文摘要：
The transformation from evanescent waves to propagation waves is the key mechanism for the realization of some super-resolution imaging methods. By using the recursive Green function and scattering-matrix theory, we investigated in details on the transport of evanescent waves through a random medium and analyzed quantitatively the coupling of evanescent channels to propagation channels. By numerical calculations, we found that the transmission for the incident evanescent channel is determined by both the eigenvalues of the scattering matrix and the coupling strength to the corresponding propagation channels in random medium, and the disorder strength of the random medium influences both of them.
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