期刊
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
卷 9, 期 4, 页码 367-373出版社
ELSEVIER
DOI: 10.1016/j.photonics.2011.04.003
关键词
Electron energy loss spectroscopy; Discontinuous Galerkin Time-Domain method; Plasmonics
资金
- Center for Functional Nanostructures (CFN) of the Deutsche Forschungsgemeinschaft (DFG) [A1.2]
- Karlsruhe Institute of Technology within the German Excellence Initiative
In this work, we demonstrate how to extract electron energy loss spectra of metallic nano-particles from time-domain computations. Specifically, we employ the Discontinuous Galerkin Time-Domain (DGTD) method in order to model the excitation of individual metallic nano-spheres and dimers of spheres by a tightly focussed electron beam. The resulting electromagnetic fields that emanate from the particles act back on the electrons and the accumulated effect determines the electrons' total energy loss. We validate this approach by comparing with analytical results for single spheres. For dimers, we find that the electron beam allows for an efficient excitation of dark modes that are inaccessible for optical spectroscopy. In addition, our time-domain approach provides a basis for dealing with materials that exhibit a significant nonlinear response. (C) 2011 Elsevier B.V. All rights reserved.
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