Absorption of light by extremely shallow metallic gratings: metamaterial behavior.
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.
Popov
Evgeny
E
Institut Fresnel, Aix-Marseille Université, CNRS, Faculté St-Jérôme, 13397 Marseille Cedex 20, France. e.popov@fresnel.fr
Enoch
Stefan
S
Bonod
Nicolas
N
D000042:Absorption; D003198:Computer Simulation; D008027:Light; D008420:Manufactured Materials; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
D008670:Metals