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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 14 — Jul. 5, 2010
  • pp: 14913–14925

Plasmon dispersion diagram and localization effects in a three-cavity commensurate grating

A. Barbara, S. Collin, Ch. Sauvan, J. Le Perchec, C. Maxime, J-L. Pelouard, and P. Quémerais  »View Author Affiliations

Optics Express, Vol. 18, Issue 14, pp. 14913-14925 (2010)

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Commensurate gratings of deep-metallic grooves have highly localized cavity resonances which do not exist for purely periodic gratings. In this paper we present the experimental dispersion diagram of the resonances of a commensurate grating with three sub-wavelength cavities per period. We observe selective light localization within the cavities, transition from a localized to a delocalized mode and modifications of the coupling of modes with the external plane-wave that may lead to the generation of black modes. This unexpected complexity is analyzed via a theoretical study in full agreement with the experiments. These results open a way to the control of wavelength-dependent hot spot predicted in more complex commensurate gratings.

© 2010 Optical Society of America

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(240.6680) Optics at surfaces : Surface plasmons
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering

ToC Category:
Optics at Surfaces

Original Manuscript: May 25, 2010
Revised Manuscript: June 22, 2010
Manuscript Accepted: June 23, 2010
Published: June 28, 2010

Aude Barbara, Stéphane Collin, Christophe Sauvan, Jérôme Le Perchec, Camille Maxime, Jean-Luc Pelouard, and Pascal Quémerais, "Plasmon dispersion diagram and localization effects in a three-cavity commensurate grating," Opt. Express 18, 14913-14925 (2010)

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