Near-field optical imaging of nanoscale optical fields and plasmon waves

Hiromi Okamoto, Kohei Imura

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Near-field optical microscopy enables spectroscopic and imaging measurements with a spatial resolution far beyond the diffraction limit of light. We show in this review that spatial structures of plasmonic wavefunctions and those of enhanced optical fields are visualized by near-field spectroscopic imaging for gold nanoparticles and their assemblies. A simple formulation for the optical observation of wavefunctions of oscillating polarization modes in nanomaterials is given. We will introduce experimental methods for near-field linear transmission and nonlinear two-photon excitation measurements. We will demonstrate that the wavefunctions of surface plasmons resonant with the incident wavelength are visualized by the near-field methods for gold nanorods. In addition, we will also show for aggregated gold nanospheres that an enhanced optical field is localized in the interstitial gaps between the particles by near-field two-photon excitation measurements.

Original languageEnglish
Pages (from-to)6055-6062
Number of pages8
JournalJapanese Journal of Applied Physics
Volume47
Issue number7 PART 3
DOIs
Publication statusPublished - 2008 Jul 18
Externally publishedYes

Fingerprint

Wave functions
near fields
Gold
Imaging techniques
Photons
gold
Plasmons
Nanospheres
Nanorods
Nanostructured materials
Optical microscopy
Diffraction
Polarization
Nanoparticles
photons
Wavelength
plasmons
assemblies
nanorods
excitation

Keywords

  • Electric-field enhancement
  • Gold nanoparticles
  • Near-field optical microscopy
  • Surface plasmon
  • Wavefunctions

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Near-field optical imaging of nanoscale optical fields and plasmon waves. / Okamoto, Hiromi; Imura, Kohei.

In: Japanese Journal of Applied Physics, Vol. 47, No. 7 PART 3, 18.07.2008, p. 6055-6062.

Research output: Contribution to journalArticle

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