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Isotropic broadband absorption by a macroscopic self-organized plasmonic crystal

Abstract : We describe the plasmonic properties of a two-dimensional periodic metallic grating of macroscopic size obtained by gold deposition on a self-assembled silica opal. Structural characterization shows a transition from microscopic order to isotropy at macroscopic scale. Optical reflection spectra exhibit a dip of almost complete absorption due to coupling to surface-plasmon-polaritons (SPP). This is explained by theoretical calculations introducing a density of coupled SPP modes. We demonstrate, at a given incidence angle, a broad continuum of coupled wavelengths over the visible spectrum. This opens new possibilities in fields where light-plasmon coupling is required over a broad range of wavelengths and incidence orientations. (C) 2011 Optical Society of America
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Submitted on : Wednesday, December 2, 2015 - 11:04:45 AM
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Hugo Frederich, Fangfang Wen, Julien Laverdant, Laurent Coolen, Catherine Schwob, et al.. Isotropic broadband absorption by a macroscopic self-organized plasmonic crystal. Optics Express, Optical Society of America - OSA Publishing, 2011, 19 (24), pp.24424-24433. ⟨10.1364/OE.19.024424⟩. ⟨hal-01236792⟩



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