Large optical transmission through a single subwavelength hole associated with a sharp-apex grating

Tsutomu Ishi, Junichi Fujikata, Keishi Ohashi

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23 Citations (Scopus)

Abstract

The effect of grating shapes on optical transmission in a bull's eye structure (a single subwavelength hole surrounded by a concentric grating in a metal) is discussed. Finite-difference time-domain calculations predict that a sharp-apex shape gives as high a reflective structure to the propagating surface plasmon polaritons (SPPs) as does a rectangular shape. Fabricated samples with a sharp-apex grating actually show large optical transmission (a factor of 400 greater than that of samples with a single hole) even when the number of corrugations is three. This result indicates that a sharp-apex grating acts as an effective SPP reflector to confine the energy around the hole, resulting in high optical throughput.

Original languageEnglish
Pages (from-to)L170-L172
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume44
Issue number1-7
DOIs
Publication statusPublished - 2005 May 2

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Keywords

  • Enhanced optical transmission
  • Grating structure
  • Resonant structure
  • SPP scattering
  • Subwavelength hole
  • Surface plasmon polariton (SPP)

ASJC Scopus subject areas

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

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