Electron-beam mapping of plasmon resonances in electromagnetically interacting gold nanorods

Moussa N'Gom, Shuzhou Li, George Schatz, Rolf Erni, Ashish Agarwal, Nicholas Kotov, Theodore B. Norris

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Abstract

Electron energy-loss spectroscopy and energy-filtered transmission electron-microscope imaging are used to characterize the energy distribution of the surface plasmon of isolated and coupled gold nanorods. Local-field enhancement and spectral shift of the plasmon modes are observed for two interacting nanoparticles. The spatial modes measured by energy loss are shown to share qualitative similarities with the electromagnetic field distribution around gold nanorods induced by optical excitation as simulated using the discrete dipole-approximation method.

Original languageEnglish
Article number113411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number11
DOIs
Publication statusPublished - Sep 29 2009

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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