Terahertz wave enhanced transmission through a single subwavelength aperture with periodic surface structures

Kunihiko Ishihara, Gen Ichi Hatakoshi, Tomofumi Ikari, Hiroaki Minamide, Hiromasa Ito, Keishi Ohashi

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We demonstrate resonantly enhanced transmission of terahertz (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 phenomenon is caused by the resonant excitation of surface waves, which are known as surface plasmon polaritons in the optical region, generated by the concentric periodic grooves. Strongly enhanced transmission of THz-wave radiation is observed through the single subwavelength circular aperture (diameter d = 100 μm). We also show that introducing the Bragg reflector to the bull's eye structure results in the further increase of the enhanced transmission.

Original languageEnglish
Pages (from-to)L1005-L1007
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume44
Issue number28-32
DOIs
Publication statusPublished - 2005 Dec 1

Keywords

  • Bragg reflector
  • Enhanced transmission
  • Periodic structure
  • Subwavelength aperture
  • Surface plasmon polariton
  • Terahertz wave

ASJC Scopus subject areas

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

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