Imaging of Plasmonic Modes of Silver Nanoparticles Using High-Resolution Cathodoluminescence Spectroscopy

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• 作者：Pratik Chaturvedi ; Keng H. Hsu ; Anil Kumar ; Kin Hung Fung ; James C. Mabon ; Nicholas X. Fang
• 刊名：ACS Nano
• 出版年：2009
• 出版时间：October 27, 2009
• 年：2009
• 卷：3
• 期：10
• 页码：2965-2974
• 全文大小：638K
• 年卷期：0
• ISSN：1936-086X

文摘

Cathodoluminescence spectroscopy has been performed on silver nanoparticles in a scanning electron microscopy setup. Peaks appearing in the visible range for particles fabricated on silicon substrate are shown to arrive from excitation of out-of-plane eigenmodes by the electron beam. Monochromatic emission maps have been shown to resolve spatial field variation of resonant plasmon mode on length scale smaller than 25 nm. Finite-difference time-domain numerical simulations are performed for both the cases of light excitation and electron excitation. The results of radiative emission under electron excitation show an excellent agreement with experiments. A complete vectorial description of induced field is given, which complements the information obtained from experiments.