Electrically tunable graphene polarization beam splitting utilizing Brewster effect

Abstract

We theoretically and numerically demonstrate that electrically tunable polarization beam splitting (PBS) can be realized by the structure of graphene ribbons supported on a dielectric film. The mechanism comes from the fact that the TE mode (like S wave polarization) is highly reflected by the plasmonic resonances of graphene ribbons, and the TM mode (like P wave polarization) is largely transmitted utilizing the Brewster effect. The results of full-wave numerical simulations reveal that a transmission splitting ratio of about 20 dB and a reflection splitting ratio of around 28 dB can be achieved with the Brewster angle incident. The proposed polarization beam splitting can be electrically tuned, which facilitates many practical applications.