Tunable graphene-based polarizer
  It is shown that an attenuated total reflection structure containing a graphene layer can operate as a tunable polarizer of the electromagnetic radiation. The polarization angle is controlled by adjusting the voltage applied to graphene via external gate. The mechanism is based on the resonant coupling of $p-$polarized electromagnetic waves to the surface plasmon-polaritons in graphene. The presented calculations show that, at resonance, the reflected wave is almost 100% $s-$polarized. 
Yuliy V. Bludov, Mikhail I. Vasilevskiy, Nuno M. R. Peres
cond-mat.mes-hall physics.optics