title: 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.
authors: Université Pierre et Marie Curie-Paris 6, UMR 7588, INSP, 4 place Jussieu, PARIS cedex 05, France.
authors: Hugo
authors: H
authors: Frederich
authors: Fangfang
authors: F
authors: Wen
authors: Julien
authors: J
authors: Laverdant
authors: Laurent
authors: L
authors: Coolen
authors: Catherine
authors: C
authors: Schwob
authors: Agnès
authors: A
authors: Maître
mesh_terms: D000042:Absorption; D016880:Anisotropy; D003460:Crystallization / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D008027:Light; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D006046:Gold