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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 7 — Apr. 2, 2007
  • pp: 4310–4320

Waveguiding in nanoscale metallic apertures

Stéphane Collin, Fabrice Pardo, and Jean-Luc Pelouard  »View Author Affiliations

Optics Express, Vol. 15, Issue 7, pp. 4310-4320 (2007)

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We study the optical properties of subwavelength metallic waveguides made of nanoscale apertures in a metal. We develop analytical expressions for the fundamental optical modes in apertures. The results are in excellent agreement with finite element calculations. This model provides a physical understanding of the role of non-perfect metallic walls, and of the shape and size of the apertures. They reveal the effect of the skin depth and of the surface plasmon polariton coupling on the waveguide modes. The nanoscopic origin of the increase of the cut-off wavelength due to the electromagnetic penetration depth in the metal is described. Simple expressions and universal curves for the effective index and the cut-off wavelength of the fundamental guided mode of any rectangular metallic waveguide are presented. The results provide an efficient tool for the design of nanoscale waveguides with real metal.

© 2007 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons
(260.2110) Physical optics : Electromagnetic optics
(260.3910) Physical optics : Metal optics

ToC Category:
Physical Optics

Original Manuscript: December 22, 2006
Revised Manuscript: February 2, 2007
Manuscript Accepted: February 6, 2007
Published: April 2, 2007

Stéphane Collin, Fabrice Pardo, and Jean-Luc Pelouard, "Waveguiding in nanoscale metallic apertures," Opt. Express 15, 4310-4320 (2007)

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