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Optics Express

Optics Express

  • Editor: C. Martijin de Sterke
  • Vol. 19, Iss. 7 — Mar. 28, 2011
  • pp: 5912–5923

Tuning plasmonic resonances of an annular aperture in metal plate

Barmak Heshmat, Dan Li, Thomas E. Darcie, and Reuven Gordon  »View Author Affiliations

Optics Express, Vol. 19, Issue 7, pp. 5912-5923 (2011)

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We present theory to describe the plasmonic resonances of a subwavelength annular aperture in a real metal plate. The theory provides the reflection, including the amplitude and phase, of radially polarized surface plasmon waves from the end faces of the aperture with a significant departure from the perfect electric conductor case due to plasmonic effects. Oscillations in the reflection amplitude and phase are observed. These oscillations arise from transverse resonances and depend on the geometry of the annulus. The theory is applied to the design of various aperture structures operating at the same resonance wavelength, and it is confirmed by comprehensive electromagnetic simulations. The results are contrasted to the perfect electric conductor case and they will be of significant interest to emerging applications in metamaterials, plasmonic sensors, and near-field optics.

© 2011 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

Original Manuscript: February 11, 2011
Revised Manuscript: March 6, 2011
Manuscript Accepted: March 9, 2011
Published: March 15, 2011

Barmak Heshmat, Dan Li, Thomas E. Darcie, and Reuven Gordon, "Tuning plasmonic resonances of an annular aperture in metal plate," Opt. Express 19, 5912-5923 (2011)

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