Transmission through single subwavelength apertures in thin metal films and effects of surface plasmons

Tuomas Vallius, Jari Turunen, Masud Mansuripur, Seppo Honkanen

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

The existing analyses on extraordinary optical transmission through apertures on a metal screen have been carried out assuming perfect conductivity or by examining arrays of closely spaced holes with subwavelength dimensions. We present an electromagnetic analysis of a single hole (modeled by use of an array of distant holes) in a finitely conducting metal membrane, applying no approximations. We demonstrate that finite conductivity is not of remarkable importance with small hole-diameter-to-wavelength ratios in the absence of strong resonances. However, if the angle of incidence of a plane wave is such that surface plasmons are excited, substantial enhancement of the transmittance can be observed, and the effect of finite conductivity will no longer be negligible. Our analysis also reveals that transmission of small apertures in highly conducting membranes can be described by approximate analytical formulas if surface waves are not excited, but with poor conductors the full electromagnetic analysis should be applied.

Original languageEnglish (US)
Pages (from-to)456-463
Number of pages8
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume21
Issue number3
DOIs
StatePublished - Mar 2004

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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