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Advances in OptoElectronics
Volume 2011 (2011), Article ID 867271, 6 pages
http://dx.doi.org/10.1155/2011/867271
Research Article

A TM-Pass/TE-Stop Polarizer Based on a Surface Plasmon Resonance

Faculty of Engineering, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo 184-8584, Japan

Received 15 June 2010; Accepted 16 July 2010

Academic Editor: Ana Vukovic

Copyright © 2011 Yuu Wakabayashi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A TM-pass/TE-stop polarizer consisting of a metal film sandwiched between dielectric gratings is investigated using the finite-difference time-domain method. At normal incidence with respect to the grating plane, a transmissivity of more than 94% and a reflectivity of more than 98% are obtained at 𝜆 = 1 . 5 5 𝜇 m for the TM and TE waves, respectively. The extinction ratio is more than 17 dB over a wavelength range of 1.50  𝜇 m to 1.75  𝜇 m. A high extinction ratio is maintained at oblique incidence, although the wavelength range shifts towards longer wavelengths. The TM-pass/TE-stop operation is also achieved with a modified structure, in which a dielectric grating is sandwiched between metal films.