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

Hiromi Okamoto*, Kohei Imura

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

16 Citations (Scopus)


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
Issue number7 PART 3
Publication statusPublished - 2008 Jul 18
Externally publishedYes


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

ASJC Scopus subject areas

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


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