Schmidt Franz-Philipp, Ditlbacher Harald, Hohenester Ulrich, Hohenau Andreas, Hofer Ferdinand, Krenn Joachim R
1] Institute of Physics, University of Graz, Universitätsplatz 5, Graz 8010, Austria [2] Institute for Electron Microscopy and Nanoanalysis (FELMI), Graz University of Technology, Steyrergasse 17, Graz 8010, Austria.
Institute of Physics, University of Graz, Universitätsplatz 5, Graz 8010, Austria.
Nat Commun. 2014 Apr 10;5:3604. doi: 10.1038/ncomms4604.
Dimensionality has a significant impact on the optical properties of solid-state nanostructures. For example, dimensionality-dependent carrier confinement in semiconductors leads to the formation of quantum wells, quantum wires and quantum dots. While semiconductor properties are governed by excitonic effects, the optical response of metal nanostructures is dominated by surface plasmons. Here we find that, in contrast to excitonic systems, the mode dispersions in plasmonic structures of different dimensionality are related by simple scaling rules. Employing electron energy loss spectroscopy, we show that the modes of silver nanodisks can be scaled to the surface and edge modes of extended silver thin films. We thereby introduce a general and intuitive ordering scheme for plasmonic excitations with edge and surface modes as the elementary building blocks.
维度对固态纳米结构的光学性质有重大影响。例如，半导体中依赖维度的载流子限制导致量子阱、量子线和量子点的形成。虽然半导体性质由激子效应控制，但金属纳米结构的光学响应则由表面等离子体主导。在这里，我们发现，与激子系统不同，不同维度的等离子体结构中的模式色散通过简单的标度规则相关联。利用电子能量损失谱，我们表明银纳米盘的模式可以标度到扩展银薄膜的表面和边缘模式。由此，我们引入了一种以边缘模式和表面模式为基本构建块的等离子体激发的通用且直观的排序方案。
