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ACS Nano. 2009 Oct 27;3(10):2965-74. doi: 10.1021/nn900571z.

Imaging of plasmonic modes of silver nanoparticles using high-resolution cathodoluminescence spectroscopy.

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Department of Mechanical Science & Engineering, University ofIllinois at Urbana-Champaign, Urbana, Illinois 61801, USA.


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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