Interpreting Chiral Nanophotonic Spectra: The Plasmonic Born-Kuhn Model
Interpreting Chiral Nanophotonic Spectra: The Plasmonic Born-Kuhn Model
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DOI：
10.1021/nl403705k
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发表时间：
2013-12-01
期刊：
影响因子：
10.8
通讯作者：
Giessen, Harald
中科院分区：
文献类型：
--
作者：
Yin, Xinghui;Schaeferling, Martin;Giessen, Harald
波恩和库恩的耦合振子模型由两个相同的、垂直位移的耦合振子组成，是理解手性介质中自然旋光性产生的最直观的经典方法之一。我们通过实验实现并讨论了其在角叠金纳米棒系统中的精确等离子体模拟。特别地，我们从杂化电磁模式和延迟的角度分析了圆二色性和旋光光谱的产生。具体来说，我们展示了如何调整纳米棒之间的垂直距离可以导致发生的键合和反键手性等离子体模式的选择性激发。
One of the most intuitive ways to classically understand the generation of natural optical activity in chiral media is provided by the coupled oscillator model of Born and Kuhn consisting of two identical, vertically displaced, coupled oscillators. We experimentally realize and discuss its exact plasmonic analog in a system of corner-stacked gold nanorods. In particular, we analyze the arising circular dichroism and optical rotatory spectra in terms of hybridized electromagnetic modes and retardation. Specifically, we demonstrate how tuning the vertical distance between the nanorods can lead to a selective excitation of the occurring bonding and antibonding chiral plasmonic modes.