Graphene-based extremely wide-angle tunable metamaterial absorber

TL;DR

This paper demonstrates a graphene-based anisotropic metamaterial that achieves near-perfect, wide-angle, tunable absorption through coupling with a fast wave-mode, enabling dynamic control via gate voltage.

Contribution

It introduces a novel graphene-based anisotropic metamaterial structure with tunable, wide-angle absorption properties, combining analytical and numerical analysis.

Findings

Near-perfect absorption over broad angles

Absorption tunable via gate voltage

Coupling with a fast wave-mode enhances absorption

Abstract

We investigate the absorption properties of graphene-based anisotropic metamaterial structures where the metamaterial layer possesses an electromagnetic response corresponding to a near-zero permittivity. We find that through analytical and numerical studies, near perfect absorption arises over an unusually broad range of beam incidence angles. Due to the presence of graphene, the absorption is tunable via a gate voltage, providing dynamic control of the energy transmission. We show that this strongly enhanced absorption arises due to a coupling between light and a fast wave-mode propagating along the graphene/metamaterial hybrid.