Polarization transmission mechanism analyzation of bi-layer nanowire polarizer

The polarization transmission of bi-layer nanowire polarizer is analyzed physically by using equivalent medium theory and Fabry-Pérot resonate theory. The principal of the two theories are explained briefly. The analyzation of grating period, duty cycle and metal height on polarization transmission can be also applied to other type of nanowire polarizers. The critical period of the grating is given. The effects of the grating parameters on polarization performance are analyzed systematically on physical level. The extraordinary optical transmission of TM and specially TE polarization light through bi-layer nanowire grating is analyzed. The analyzation of the polarization transmission mechanism will be helpful for the design and fabrication of the gratings with good polarization properties.