Tunable electromagnetic chirality induced by graphene inclusions in multi-layered metamaterials

TL;DR

This paper presents a theoretical study of multi-layered graphene-dielectric metamaterials that exhibit tunable electromagnetic chirality through external voltage control of graphene's chemical potential, enabling adjustable magneto-electric responses.

Contribution

It introduces a novel multi-layered metamaterial design with graphene inclusions that can be actively tuned to control electromagnetic chirality and magneto-electric coupling.

Findings

The structure exhibits a magneto-electric coupling characterized by an effective chiral parameter.

Tuning the graphene chemical potential modulates both dielectric and chiral electromagnetic responses.

The metamaterial's electromagnetic properties are controllable via external voltage gating of graphene.

Abstract

We theoretically investigate the electromagnetic response of a novel class of multi-layered metamaterials obtained by alternating graphene sheets and dielectric layers, the whole structure not exhibiting a plane of reflection symmetry along the stacking direction. We show that the electromagnetic response of the structure is characterized by a magneto-electric coupling described by an effective chiral parameter. Exploiting the intrinsic tunability of the graphene-light coupling, we prove that one can tune both the dielectric and the chiral electromagnetic response by varying the graphene chemical potential through external voltage gating.