Fabry-Perot enhanced Faraday rotation in graphene

TL;DR

This paper demonstrates that combining Fabry-Perot interference with graphene enhances Faraday rotation and transmission in the terahertz range, advancing magneto-optical device capabilities.

Contribution

It introduces a method to amplify Faraday rotation in graphene using Fabry-Perot cavities, providing a new approach for magneto-optical applications.

Findings

Achieved Faraday rotation up to 0.15 radians (9°) in multilayer graphene.

Enhanced transmission alongside increased Faraday rotation.

Spectrally resolved interference fringes in the terahertz spectra.

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{\deg}) is attained. Further, we discuss and compare other ways to increase the Faraday rotation using the principle of an optical cavity.