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Article Dans Une Revue Optics Express Année : 2010

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

Résumé

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 reso- nances 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
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hal-00903571 , version 1 (04-12-2015)

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Aude Barbara, Stéphane Collin, Christophe Sauvan, Jérôme Le Perchec, Camille Maxime, et al.. Plasmon dispersion diagram and localization effects in a three-cavity commensurate grating. Optics Express, 2010, 18 (14), pp.14913-14925. ⟨10.1364/OE.18.014913⟩. ⟨hal-00903571⟩
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