A TM-PassTE-Stop Polarizer Based on a Surface Plasmon Resonance

الملخص EN

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=1.55 μm for the TM and TE waves, respectively.

The extinction ratio is more than 17 dB over a wavelength range of 1.50 μm to 1.75 μm.

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.