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arXiv 1009.4592physics.optics
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Total internal reflection和倏逝增益

Total internal reflection and evanescent gain

Jon Olav Grepstad, Johannes Skaar

摘要:

当光从高折射率介质入射到低折射率介质上时,对于大的入射角发生全内反射。我们考虑的情况下,低指数介质是活跃的。通过调用其最基本的形式的因果关系,我们认为,倏逝增益可能会出现或可能不会出现,这取决于介电常数函数的分析和全局属性。对于传统的弱增益介质,我们表明,有一个绝对的不稳定性与无限的横向尺寸。这种不稳定性可以忽略或消除在某些情况下,其中倏逝增益占主导地位。

英文摘要:

Total internal reflection occurs for large angles of incidence, when light is incident from a high-refractive-index medium onto a low-index medium. We consider the situation where the low-index medium is active. By invoking causality in its most fundamental form, we argue that evanescent gain may or may not appear, depending on the analytic and global properties of the permittivity function. For conventional, weak gain media, we show that there is an absolute instability associated with infinite transversal dimensions. This instability can be ignored or eliminated in certain cases, for which evanescent gain prevails.

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