Institute of Physics, University of Graz , 8010 Graz, Austria.
Institute for Electron Microscopy and Nanoanalysis, Graz University of Technology , 8010 Graz, Austria.
Nano Lett. 2016 Aug 10;16(8):5152-5. doi: 10.1021/acs.nanolett.6b02097. Epub 2016 Jul 20.
The coupling of plasmonic nanoparticles can strongly modify their optical properties. Here, we show that the coupling of the edges within a single rectangular particle leads to mode splitting and the formation of bonding and antibonding edge modes. We are able to unambiguously designate the modes due to the high spatial resolution of electron microscopy-based electron energy loss spectroscopy and the comparison with numerical simulations. Our results provide simple guidelines for the interpretation and the design of plasmonic mode spectra.
等离子体纳米粒子的耦合可以强烈地改变它们的光学性质。在这里，我们表明，单个矩形粒子内的边缘耦合会导致模式分裂，并形成键合和反键合边缘模式。由于基于电子显微镜的电子能量损失光谱的高空间分辨率以及与数值模拟的比较，我们能够明确地指定模式。我们的结果为等离子体模式光谱的解释和设计提供了简单的指导原则。
