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

Pratik Chaturvedi, Keng H. Hsu, Anil Kumar, Kin Hung Fung, James C. Mabon, Nicholas X. Fang

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)2965-2974
Number of pages10
JournalACS nano
Volume3
Issue number10
DOIs
StatePublished - Oct 27 2009

Keywords

  • Cathodoluminescence
  • Eigenmodes
  • Extinction
  • Nanoparticles
  • Plasmonics

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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