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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 18 — Aug. 31, 2009
  • pp: 15652–15658

Substrate effect on aperture resonances in a thin metal film

J. H. Kang, Jong-Ho Choe, D. S. Kim, and Q-Han Park  »View Author Affiliations

Optics Express, Vol. 17, Issue 18, pp. 15652-15658 (2009)

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We present a simple theoretical model to study the effect of a substrate on the resonance of an aperture in a thin metal film. The transmitted energy through an aperture is shown to be governed by the coupling of aperture waveguide mode to the incoming and the outgoing electromagnetic waves into the substrate region. Aperture resonance in the energy transmission thus depends critically on the refractive index of a substrate. We explain the substrate effect on aperture resonance in terms of destructive interference among evanescent modes or impedance mismatch. Our model shows an excellent agreement with a rigorous FDTD calculation and is consistent with previous experimental observations.

© 2009 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(310.0310) Thin films : Thin films
(050.5745) Diffraction and gratings : Resonance domain
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

Original Manuscript: July 16, 2009
Revised Manuscript: August 14, 2009
Manuscript Accepted: August 18, 2009
Published: August 19, 2009

J. H. Kang, Jong-Ho Choe, D. S. Kim, and Q-Han Park, "Substrate effect on aperture resonances in a thin metal film," Opt. Express 17, 15652-15658 (2009)

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