期刊
NANO LETTERS
卷 12, 期 2, 页码 1058-1062出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl204303d
关键词
Plasmon; Fano resonance; electromagnetically induced transparency; dark field; spectroscopy; cathodoluminescence; nanoparticle; Alzar model; coupled oscillator
类别
资金
- National Science Foundation Major Research Instrumentation (MRI) [ECCS-1040478]
- Defense Threat Reduction Agency (DTRA) [HDTRA1-11-1-0040]
- National Security Science and Engineering Faculty Fellowship (NSSEFF) [N00244-09-1-0067]
- Robert A. Welch Foundation [C-1220, C-1222]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1040478] Funding Source: National Science Foundation
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.
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