Open AccessAbsorbing polarization selective resonant gratings
Author(s) -
Anni Lehmuskero,
Ismo Vartiainen,
Toni Saastamoinen,
Tapani Alasaarela,
Markku Kuittinen
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.027270
Subject(s) - materials science , guided mode resonance , optics , electron beam lithography , extinction ratio , grating , surface plasmon resonance , polarization (electrochemistry) , atomic layer deposition , lithography , wavelength , rigorous coupled wave analysis , absorption (acoustics) , resonance (particle physics) , optoelectronics , molar absorptivity , diffraction grating , resist , layer (electronics) , nanotechnology , nanoparticle , chemistry , atomic physics , physics , composite material
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.