非手性纳米天线介导的表面增强圆二色光谱
Surface enhanced circular dichroism spectroscopy mediated by non-chiral nanoantennas
摘要：
我们从理论上研究了非手性纳米天线存在下手性分子的光物质相互作用。支持光频电或磁偶极子的各向同性纳米结构足以局部增强分子的手性极化率的激发，从而增强其圆二色性光谱。然而，同时电和磁偶极子是必要的，以实现净，空间平均增强。我们的贡献提供了一个理论框架，以了解手性光-物质在纳米尺度上的相互作用，并设置了必要和充分的条件，以提高圆二色光谱在纳米天线的存在。结果可能导致新的，场增强，手性光谱技术。
英文摘要：
We theoretically investigate light matter interactions for chiral molecules in the presence of non-chiral nanoantennas. Isotropic nanostructures supporting optical-frequency electric or magnetic dipoles are sufficient to locally enhance the excitation of a molecule's chiral polarizability and thus its circular dichroism spectrum. However, simultaneous electric and magnetic dipoles are necessary to achieve a net, spatially-averaged enhancement. Our contribution provides a theoretical framework to understand chiral light-matter interactions at the nanoscale and sets the necessary and sufficient conditions to enhance circular dichroism spectroscopy in the presence of nanoantennas. The results may lead to new, field-enhanced, chiral spectroscopic techniques.
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