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Spectral signatures of chirality

机译:手性的光谱特征

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摘要

We present a new way of measuring chirality, via the spectral shift of photonic band gaps in one-dimensional structures. We derive an explicit mapping of the problem of oblique incidence of circularly polarized light on a chiral one-dimensional photonic crystal with negligible index contrast to the formally equivalent problem of linearly polarized light incident on-axis on a non-chiral structure with index contrast. We derive analytical expressions for the first-order shifts of the band gaps for negligible index contrast. These are modified to give good approximations to the band gap shifts also in the case of appreciable index contrast. We believe that this may potentially be used for measuring enantiomeric excess.
机译:我们通过一维结构中的光子带隙的光谱位移,提出了一种测量手性的新方法。我们导出了圆偏振光在折射率手性可忽略不计的手性一维光子晶体上与线偏振光在轴上入射具有折射率对比的非手性结构的形式等效问题的斜入射问题的显式映射。我们得出带隙的一阶位移的分析表达式,其折射率对比可忽略不计。在明显的折射率对比的情况下,也对它们进行了修改,以使带隙位移近似良好。我们认为这可能用于测量对映体过量。

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