Magnetoplasmonic Enhancement of Faraday Rotation in Patterned Graphene Metasurfaces

TL;DR

This paper demonstrates that patterned graphene metasurfaces can enhance and extend Faraday rotation into higher frequencies in the THz range by utilizing magneto-plasmons, with tunability via electric and magnetic fields.

Contribution

It introduces a novel design of graphene metasurfaces that overcome frequency limitations of Faraday rotation and provides experimental and theoretical insights into magneto-plasmon effects.

Findings

Enhanced Faraday rotation at higher THz frequencies

Excellent agreement between theory and experiment

Demonstrated tunability with electric and magnetic biasing

Abstract

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