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

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

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
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume44
Issue number28-32
DOIs
Publication statusPublished - 2005
Externally publishedYes

Fingerprint

Terahertz waves
Plate metal
near fields
Diffraction
apertures
Imaging techniques
Radiation
spatial resolution
Metals
metal plates
grooves
electromagnetic radiation
diffraction
metals

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture. / Ishihara, Kunihiko; Ikari, Tomofumi; Minamide, Hiroaki; Shikata, Jun Ichi; Ohashi, Keishi; Yokoyama, Hiroyuki; Ito, Hiromasa.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 44, No. 28-32, 2005.

Research output: Contribution to journalArticle

Ishihara, Kunihiko ; Ikari, Tomofumi ; Minamide, Hiroaki ; Shikata, Jun Ichi ; Ohashi, Keishi ; Yokoyama, Hiroyuki ; Ito, Hiromasa. / Terahertz near-field imaging using enhanced transmission through a single subwavelength aperture. In: Japanese Journal of Applied Physics, Part 2: Letters. 2005 ; Vol. 44, No. 28-32.
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AU - Yokoyama, Hiroyuki

AU - Ito, Hiromasa

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