Near-field spectroscopy of surface plasmons in flat gold nanoparticles

M. Achermann, K. L. Shuford, G. C. Schatz, D. H. Dahanayaka, L. A. Bumm, V. I. Klimov

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We use near-field interference spectroscopy with a broadband femtosecond, white-light probe to study local surface plasmon resonances in flat gold nanoparticles (FGNPs). Depending on nanoparticle dimensions, local near-field extinction spectra exhibit none, one, or two resonances in the range of visible wavelengths (1.6-2.6 eV). The measured spectra can be accurately described in terms of interference between the field emitted by the probe aperture and the field reradiated by driven FGNP surface plasmon oscillations. The measured resonances are in good agreement with those predicted by calculations using discrete dipole approximation. We observe that the amplitudes of these resonances are dependent upon the spatial position of the near-field probe, which indicates the possibility of spatially selective excitation of specific plasmon modes.

Original languageEnglish
Pages (from-to)2254-2256
Number of pages3
JournalOptics Letters
Volume32
Issue number15
DOIs
Publication statusPublished - Aug 1 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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