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The unique gate-voltage dependent optical properties of graphene make it apromising electrically-tunable plasmonic material. In this work, we proposedin-situ control of the polarization of nanoantennas by combining plasmonicstructures with an electrostatically tunable graphene monolayer. The tunablepolarizer is designed based on an asymmetric cross nanoantenna comprising twoorthogonal metallic dipoles sharing the same feed gap. Graphene monolayer isdeposited on a Si/SiO2 substrate, and inserted beneath the nanoantenna. Ourmodelling demonstrates that as the chemical potential is incremented up to 1 eVby electrostatic doping, resonant wavelength for the longer graphene-loadeddipole is blue shifted for 500 nm (~ 10% of the resonance) in the mid-infraredrange, whereas the shorter dipole experiences much smaller influences due tothe unique wavelength-dependent optical properties of graphene. In this way,the relative field amplitude and phase between the two dipole nanoantennas areelectrically adjusted, and the polarization state of the reflected wave can beelectrically tuned from the circular into near-linear states with the axialratio changing over 8 dB. Our study thus confirms the strong light-grapheneinteraction with metallic nanostructures, and illuminates promises forhigh-speed electrically controllable optoelectronic devices.

Electrically Tunable Polarizer Based on Graphene-loaded Plasmonic Cross Antenna