具有奇偶时间对称性的双层结构中的低相干诱导共振
Low coherence-induced resonance in double-layer structures having parity-time symmetry
摘要：
在空间频率图象下，利用二阶经典相干理论，导出了高斯-谢尔光束入射到任意分层介质结构上的透射率$T$和反射率$R$的简单公式。的形式主义是适用于一个特定的结构组成的双层，平衡的增益和损耗，满足奇偶时间对称条件。结果表明，具有低程度的空间相干性的源，在波长的顺序上，可以引起大的共振峰的透射和反射振幅。共振峰随着空间相干性的增加而消失。
英文摘要：
We derive simple formulae for the transmittance $T$ and reflectance $R$ of Gaussian-Schell beams incident upon any stratified dielectric structure by using second-order classical coherence theory in the space-frequency picture. The formalism is applied to a particular structure consisting of a double-layer, with balanced gain and loss, satisfying the parity-time symmetry conditions. It is shown that sources with a low degree of spatial coherence, on the order of the wavelength, can induce large resonant peaks in the transmitted and reflected amplitudes. The resonance peaks vanish as the spatial coherence increases.
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