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

Optics Express
A BarbaraP Quémerais

Abstract

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.

References

Apr 11, 1994·Physical Review Letters·M I StockmanT F George
May 21, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·T A LeskovaJ Munõz-Lopez
Dec 31, 2005·Physical Review Letters·Diana C Skigin, Ricardo A Depine
Aug 16, 2006·Physical Review Letters·J Le PerchecT López-Ríos
Mar 30, 2007·Nature·Tatsunosuke MatsuiZ Valy Vardeny
Jan 17, 2008·Optics Letters·Cyrille BillaudeauJean-Luc Pelouard
Jul 8, 2009·Optics Express·A BarbaraP Quémerais

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