Department of Chemical Engineering and Materials Science, University of Minnesota-Twin Cities , 421 Washington Ave SE, Minneapolis, Minnesota 55455, United States.
Materials Science Division, Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, California 94720, United States.
Nano Lett. 2015 Dec 9;15(12):8336-41. doi: 10.1021/acs.nanolett.5b03970. Epub 2015 Nov 25.
Chiral plasmonic systems have been shown to exhibit large chiroptical responses, much larger than those found in molecular or solid state systems. In this Letter, we investigate the role of resonant coupling in such systems and whether the formation of collective plasmonic modes in a chiral assembly of metallic nanostructures is a necessary condition for chiroptical response. We show in experiment and simulation that off-resonant coupling between spectrally detuned nanostructures arranged with structural chirality leads to a clear but weak chiroptical response. We interpret our results in the framework of scattering between the individual constituents that in turn leads to a chiroptical farfield response. We envision that our results will allow further tuning and manipulation of chiroptical responses in plasmonic systems for tailored chiral light matter interaction.
手性等离子体系统被证明具有较大的手性光学响应，远远大于分子或固态系统中发现的响应。在这封信中，我们研究了共振耦合在这种系统中的作用，以及在手性金属纳米结构组装体中形成集体等离子体模式是否是手性光学响应的必要条件。我们通过实验和模拟表明，具有结构手性的光谱失谐纳米结构之间的非共振耦合导致了清晰但较弱的手性光学响应。我们在单个组成部分之间散射的框架内解释了我们的结果，这反过来又导致了手性远场响应。我们设想，我们的结果将允许在手性光物质相互作用方面进一步调整和操纵等离子体系统中的手性光学响应。
