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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 6 — Mar. 21, 2005
  • pp: 1933–1938

Increased cut-off wavelength for a subwavelength hole in a real metal

Reuven Gordon and Alexandre G. Brolo  »View Author Affiliations

Optics Express, Vol. 13, Issue 6, pp. 1933-1938 (2005)

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A waveguide mode of a subwavelength rectangular hole in a real metal is analyzed. Due to coupling between surface plasmons on the long edges of the hole, the cut-off wavelength increases as the hole-width is reduced. The cut-off wavelength is found to be much larger than Rayleigh’s criterion for perfect metals — 2.3 times as large for a 15 nm wide hole. The analytical results are verified by finite-difference calculations. The finite difference calculations also show the influence of including material loss.

© 2005 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Research Papers

Original Manuscript: February 9, 2005
Revised Manuscript: March 4, 2005
Published: March 21, 2005

Reuven Gordon and Alexandre Brolo, "Increased cut-off wavelength for a subwavelength hole in a real metal," Opt. Express 13, 1933-1938 (2005)

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