Near-field imaging of optical field and plasmon wavefunctions in metal nanoparticles

Hiromi Okamoto, Kohei Imura

研究成果: Article

55 引用 (Scopus)

抄録

Scanning near-field optical microscopes enable optical measurements and observations with a spatial resolution far beyond the diffraction limit of light. This allows us to spatially resolve the positions in nanoparticles and at the same time to investigate spectroscopic characteristics point by point. In this feature article, we focus on near-field microscopic studies on surface plasmons in anisotropic gold nanoparticles and aggregates (nanorods, triangular nanoplates, and aggregated nanospheres). We have utilized linear transmission/scattering as well as nonlinear two-photon excitation measurements in the near field, to observe the local electric field or electromagnetic local density of states. We show that the wavefunction of the plasmon excitation in the nanoparticle resonant with the incident radiation field is visualized by the near-field methods. In the aggregated nanoparticles, strong electric-field enhancement localized in the interstitial sites, which was theoretically predicted previously, is clearly imaged, and its major contribution to surface enhanced Raman scattering is also shown by the near-field images.

元の言語English
ページ(範囲)3920-3928
ページ数9
ジャーナルJournal of Materials Chemistry
16
発行部数40
DOI
出版物ステータスPublished - 2006
外部発表Yes

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Metal nanoparticles
Wave functions
near fields
Nanoparticles
Imaging techniques
nanoparticles
metals
Electric fields
Plasmons
Nanospheres
Nanorods
Gold
electric fields
incident radiation
Raman scattering
optical microscopes
Microscopes
plasmons
optical measurement
Photons

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

これを引用

Near-field imaging of optical field and plasmon wavefunctions in metal nanoparticles. / Okamoto, Hiromi; Imura, Kohei.

:: Journal of Materials Chemistry, 巻 16, 番号 40, 2006, p. 3920-3928.

研究成果: Article

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