Near-field optical imaging of plasmon modes in gold nanorods

Kohei Imura, Tetsuhiko Nagahara, Hiromi Okamoto

研究成果: Article

134 引用 (Scopus)

抜粋

We have investigated optical properties of single gold nanorods by using an apertured-type scanning near-field optical microscope. Near-field transmission spectrum of single gold nanorod shows several longitudinal surface plasmon resonances. Transmission images observed at these resonance wavelengths show oscillating pattern along the long axis of the nanorod. The number of oscillation increases with decrement of observing wavelength. These spatial characteristics were well reproduced by calculated local density-of-states maps and were attributed to spatial characteristics of plasmon modes inside the nanorods. Dispersion relation for plasmons in gold nanorods was obtained by plotting the resonance frequencies of the plasmon modes versus the wave vectors obtained from the transmission images.

元の言語English
記事番号154701
ジャーナルJournal of Chemical Physics
122
発行部数15
DOI
出版物ステータスPublished - 2005 4 15
外部発表Yes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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