Graphene-based perfect optical absorbers harnessing guided mode resonances

TL;DR

This paper presents a combined numerical and experimental study of graphene-based optical absorbers that utilize guided mode resonances to achieve near-perfect absorption with significantly enhanced efficiency across visible and near-infrared wavelengths.

Contribution

It introduces a novel design of graphene-based absorbers exploiting GMRs, demonstrating both theoretical analysis and experimental validation of high absorption efficiency.

Findings

Achieved near-perfect absorption over a few nanometers bandwidth.

Demonstrated 40-fold increase in graphene absorption.

Validated theoretical predictions with experimental results.

Abstract

We numerically and experimentally investigate graphene-based optical absorbers that exploit guided mode resonances (GMRs) achieving perfect absorption over a bandwidth of few nanometers (over the visible and near-infrared ranges) with a 40-fold increase of the monolayer graphene absorption. We analyze the influence of the geometrical parameters on the absorption rate and the angular response for oblique incidence. Finally, we experimentally verify the theoretical predictions in a one-dimensional, dielectric grating and placing it near either a metallic or a dielectric mirror.