Fabry-Perot enhanced Faraday rotation in graphene

Abstract

We demonstrate that giant Faraday rotation in graphene in the terahertz range due to the cyclotron resonance is further increased by constructive Fabry-Perot interference in the supporting substrate. Simultaneously, an enhanced total transmission is achieved, making this effect doubly advantageous for graphene-based magneto-optical applications. As an example, we present far-infrared spectra of epitaxial multilayer graphene grown on the C-face of 6H-SiC, where the interference fringes are spectrally resolved and a Faraday rotation up to 0.15 radians (9°) is attained. Further, we discuss and compare other ways to increase the Faraday rotation using the principle of an optical cavity.

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• Magneto-optical effects in the Landau level manifold of 2D lattices with spin-orbit interaction
• Magneto-optical Kramers-Kronig analysis
• Hybrid graphene/silicon integrated optical isolators with photonic spin-orbit interaction