Raman activity and dynamics of plasmons on a rough gold film studied by ultrafast scanning near-field optical microscopy

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We investigated the surface-enhanced Raman scattering activity and spatio-temporal characteristics of plasmons excited on a rough gold film using ultrafast near-field optical microscopy. Near-field nonlinear excitation images showed a number of optically amplified spots on the sample surface. Raman scattering from molecules dispersed on the sample was enhanced at the amplified fields in a space-selective manner. Time-resolved near-field measurements revealed that the dephasing time varies depending on the excited plasmon. We evaluated the resonant mode volume from the Raman signal enhancement and the dephasing time of the plasmon, and found that the volume is on the same order as the one estimated from the topography of the sample.

Original languageEnglish
Title of host publicationFrontiers of Plasmon Enhanced Spectroscopy, Volume 2
PublisherAmerican Chemical Society
Pages121-137
Number of pages17
Volume1246
ISBN (Electronic)9780841232013
DOIs
Publication statusPublished - 2016

Publication series

NameACS Symposium Series
Volume1246
ISSN (Print)00976156
ISSN (Electronic)19475918

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Imaeda, K., & Imura, K. (2016). Raman activity and dynamics of plasmons on a rough gold film studied by ultrafast scanning near-field optical microscopy. In Frontiers of Plasmon Enhanced Spectroscopy, Volume 2 (Vol. 1246, pp. 121-137). (ACS Symposium Series; Vol. 1246). American Chemical Society. https://doi.org/10.1021/bk-2016-1246.ch006