Designing and Deconstructing the Fano Lineshape in Plasmonic Nanoclusters
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- 作者：J. Britt Lassiter ; Heidar Sobhani ; Mark W. Knight ; Witold S. Mielczarek ; Peter Nordlander ; Naomi J. Halas
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：February 8, 2012
- 年：2012
- 卷：12
- 期：2
- 页码：1058-1062
- 全文大小：279K
- 年卷期：v.12,no.2(February 8, 2012)
- ISSN：1530-6992
文摘
By varying the relative dimensions of the central and peripheral disks of a plasmonic nanocluster, the depth of its Fano resonance can be systematically modified; spectral windows where the scattering cross section of the nanocluster is negligible can be obtained. In contrast, electron-beam excitation of the plasmon modes at specific locations within the nanocluster yields cathodoluminescence spectra with no Fano resonance. By examining the selection rules for plasmon excitation in the context of a coupled oscillator picture, we provide an intuitive explanation of this behavior based on the plasmon modes observed for optical and electron-beam excitation in this family of nanostructures.