▎ 摘　　要

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.