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arXiv 1506.02436physics.optics
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隐形的角度

An angle on invisibility

H. F. Jones, M. Kulishov

摘要:

具有折射率分布$e^{iβz}$的$PT$对称光栅已被证明具有对于从一侧入射的光基本上不可见的有趣特性,同时对于从另一侧入射的光在特定波长处具有大大增强的反射。我们扩展了以前的分析,这种光栅获得的情况下,当光栅嵌入在基板上,具有不同的折射率在两侧的解析解。我们还将前面的垂直入射的情况推广到任意角度的入射。在这种情况下,对于给定波长,在特定入射角处发生增强反射。最后,我们讨论了如何利用光栅产生激光。

英文摘要:

The $PT$-symmetric optical grating with index profile $e^{iβz}$ has been shown to have the interesting property of being essentially invisible for light incident from one side, while possessing greatly enhanced reflection at a particular wavelength for light incident from the other side. We extend a previous analysis of this grating to obtain an analytic solution for the case when the grating is embedded on a substrate, with different refractive indices on either side. We also generalize the previous case of normal incidence to incidence at an arbitrary angle. In that case the enhanced reflection occurs at a particular angle of incidence for a given wavelength. Finally we discuss how the grating may be used to give lasing.

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