Tunable ultra-high-efficiency light absorption of monolayer graphene using critical coupling with guided resonance

TL;DR

This paper introduces a novel multilayer photonic structure that achieves near-perfect light absorption in monolayer graphene at telecommunication wavelengths through critical coupling with guided resonance, enabling high-efficiency optoelectronic devices.

Contribution

It demonstrates the first complete absorption of single-atomic-layer graphene using a critical coupling mechanism, advancing light-graphene interaction techniques.

Findings

Achieves near 99% absorption in monolayer graphene.

Designs allow spectral selectivity in the near-infrared range.

Enables practical high-performance optoelectronic applications.

Abstract

We numerically demonstrate a novel monolayer graphene-based perfect absorption multi-layer photonic structure by the mechanism of critical coupling with guided resonance, in which the absorption of graphene can significantly close to 99% at telecommunication wavelengths. The highly efficient absorption and spectral selectivity can be obtained with designing structural parameters in the near infrared ranges. Compared to previous works, we achieve the complete absorption of single-atomic-layer graphene in the perfect absorber for the first time, which not only opens up new methods of enhancing the light-graphene interaction, but also makes for practical applications in high-performance optoelectronic devices, such as modulators and sensors.