Journal
ACS NANO
Volume 3, Issue 10, Pages 2965-2974Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn900571z
Keywords
cathodoluminescence; plasmonics; nanoparticles; extinction; eigenmodes
Categories
Funding
- U.S. Department of Energy [DE-FG02-07ER46453, DE-FG02-07ER46471]
- Defense Advanced Research Projects Agency [HR0011-05-3-0002]
- Office of Naval Research [N00173-07-G013]
- National Science Foundation [CMMI-0709023]
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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.
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