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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 23 — Nov. 10, 2008
  • pp: 19127–19135

Generation and control of hot spots on commensurate metallic gratings

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

Optics Express, Vol. 16, Issue 23, pp. 19127-19135 (2008)

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We study the light localization on commensurate arrangements of deep metallic sub-wavelength grooves. We theoretically show that as the degree of commensuration tends to an irrational number new light localization states are produced. These have properties close to that reported for hot spots on disordered surfaces and are not permitted for simple period gratings. Existence of these new resonances is experimentally provided in the infra-red region by reflectivity measurements performed on two commensurate samples with respectively two and three slits per period. Manipulations of these hot spots which can be controlled from far-field could be used for high sensitivity spectroscopy applications.

© 2008 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(050.6624) Diffraction and gratings : Subwavelength structures
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering

ToC Category:
Optics at Surfaces

Original Manuscript: September 26, 2008
Revised Manuscript: October 7, 2008
Manuscript Accepted: October 12, 2008
Published: November 4, 2008

A. Barbara, J. Le Perchec, S. Collin, C. Sauvan, J-L. Pelouard, T. López-Ríos, and P. Quémerais, "Generation and control of hot spots on commensurate metallic gratings," Opt. Express 16, 19127-19135 (2008)

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