Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture

Kunihiko Ishihara*, Tomofumi Ikari, Hiroaki Minamide, Jun Ichi Shikata, Keishi Ohashi, Hiroyuki Yokoyama, Hiromasa Ito

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


We demonstrate terahertz (THz) near-field imaging using resonantly enhanced transmission of THz-wave radiation (λ ∼ 200μm) through a bull's eye structure (a single subwavelength aperture surrounded by concentric periodic grooves in a metal plate). The bull's eye structure shows extremely large enhanced transmission, which has the advantage for a single subwavelength aperture. The spatial resolution for the bull's eye structure (with an aperture diameter d = 100 μm) is evaluated in the near-field region, and a resolution of 50 μm (corresponding to λ/4) is achieved. We obtain the THz near-field images of the subwavelength metal pattern with a spatial resolution below the diffraction limit.

Original languageEnglish
Pages (from-to)L929-L931
JournalJapanese Journal of Applied Physics, Part 2: Letters
Issue number28-32
Publication statusPublished - 2005
Externally publishedYes


  • Enhanced transmission
  • Near-field imaging
  • Periodic structure
  • Subwavelength aperture
  • Surface plasmon polariton
  • Terahertz wave

ASJC Scopus subject areas

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


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