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A TM-pass/TE-stop polarizer consisting of ametal film sandwiched between dielectric gratings is investigatedusing the finite-difference time-domain method. Atnormal incidence with respect to the grating plane, a transmissivityof more than 94% and a reflectivity of more than98% are obtained at =1.55 m for the TM and TE waves,respectively. The extinction ratio is more than 17 dB overa wavelength range of 1.50 m to 1.75 m. A high extinctionratio is maintained at oblique incidence, although thewavelength range shifts towards longer wavelengths. TheTM-pass/TE-stop operation is also achieved with a modifiedstructure, in which a dielectric grating is sandwichedbetween metal films

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