title: Absorbing polarization selective resonant gratings.
abstract: We introduce resonant absorbers that consist of linear metal wires embedded inside of a titanium dioxide grating. We show that in these structures the guided-mode resonance may lead to the almost total absorption of one polarization component and greatly enhance the absorption in localized surface plasma resonance. In addition, we show that the structures have potential to function as filters or polarizing beamsplitters. Absorption of 99.67 % has been obtained together with the contrast of 6600 at the wavelength of 532 nm. This corresponds the extinction of 8.8597. The results have been verified experimentally by fabricating an absorbing filter with electron beam lithography and atomic layer deposition technique. The absorption is remarkably high considering the thickness of the structures which is only 219-333 nm.
authors.affiliation: University of Eastern Finland, Department of Physics and Mathematics, Joensuu, Finland. anni.lehmuskero@uef.fi
authors.forename: Anni
authors.initials: A
authors.lastname: Lehmuskero
authors.forename: Ismo
authors.initials: I
authors.lastname: Vartiainen
authors.forename: Toni
authors.initials: T
authors.lastname: Saastamoinen
authors.forename: Tapani
authors.initials: T
authors.lastname: Alasaarela
authors.forename: Markku
authors.initials: M
authors.lastname: Kuittinen
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*