Magnetoplasmonic Enhancement of Faraday Rotation in Patterned Graphene Metasurfaces

摘要

Faraday rotation is a fundamental property present in all non-reciprocaloptical elements. In the THz range, graphene displays strong Faraday rotation;unfortunately, it is limited to frequencies below the cyclotron resonance. Herewe show experimentally that in specifically design metasurfaces,magneto-plasmons can be used to circumvent this limitation. We find excellentagreement between theory and experiment and provide new physical insights andpredictions on these phenomena. Finally, we demonstrate strong tuneability inthese metasurfaces using electric and magnetic field biasing.