Terahertz response of patterned epitaxial graphene

Christian Sorger, Sascha Preu, Johannes Schmidt, Stephan Winnerl, Yuliy V Bludov, Nuno M R Peres, Mikhail I Vasilevskiy, Heiko B Weber
2015 New Journal of Physics  
We study the interaction between polarized terahertz (THz) radiation and micro-structured large-area graphene in transmission geometry. In order to efficiently couple the radiation into the two-dimensional material, a lateral periodic patterning of a closed graphene sheet by intercalation doping into stripes is chosen, yielding unequal transmittance of the radiation polarized parallel and perpendicular to the stripes. Indeed, a polarization contrast up to 20% is observed. The effect even
more » ... es up to 50% when removing graphene stripes in analogy to a wire grid polarizer. The polarization dependence is analyzed in a large frequency range from < 80 GHz to 3 THz, including the plasmon-polariton resonance. The results are in excellent agreement with theoretical calculations based on the electronic energy spectrum of graphene and the electrodynamics of the patterned structure.
doi:10.1088/1367-2630/17/5/053045 fatcat:f7bcoqssj5drrpo5q5lztdjwsa