Selective Near Perfect Light Absorbtion by Graphene Monolayer Using Aperiodic Multilayer Microstructures

TL;DR

This paper demonstrates a method to achieve near-perfect light absorption in a graphene monolayer at specific wavelengths using aperiodic multilayer microstructures optimized by genetic algorithms, without metal or surface patterning.

Contribution

It introduces a novel, metal-free approach for tunable near-total absorption in graphene using aperiodic multilayers optimized by genetic algorithms.

Findings

Achieves near-total absorption peaks in the near-infrared and visible spectrum.

Demonstrates tunability of absorption peaks across a wide wavelength range.

Validates the approach with transfer matrix and coupled mode theory analyses.

Abstract

We investigate 1D aperiodic multilayer microstructures in order to achieve near total absorption in preselected wavelengths in a graphene monolayer. Our structures are designed by a genetic optimization algorithm coupled to a transfer matrix code. Coupled mode theory (CMT) analysis, in accordance with transfer matrix method (TMM) results, indicates the existence of a critical coupling in a graphene monolayer for perfect absorptions. Our findings show that the near-total-absorption peaks are highly tunable and can be controlled simultaneously or independently in wide range of wavelengths in the near-infrared and visible. Our proposed approach is metal free and does not require surface texturing or patterning, and can be applied for other two dimensional (2D) materials.