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Opt Express. 2009 Apr 13;17(8):6770-81.

Absorption of light by extremely shallow metallic gratings: metamaterial behavior.

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  • 1Institut Fresnel, Aix-Marseille Université, CNRS, Faculté St-Jérôme, 13397 Marseille Cedex 20, France.


Extremely shallow lamellar metallic gratings are shown to totally absorb incident light inside a wide angular interval. The full absorption still holds at the homogeneization limit when the period tends toward zero. It is shown that a lamellar grating, illuminated in normal incidence and in transerve magnetic polarization with a period lower than 1/, of the vacuum wavelength behaves like a dielectric one with a high refractive index. The full absorption is then not due to the excitation of surface plasmon but either to Fabry-Perot resonance or Brewster effect, depending on the corrugated layer thickness.

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