Approaching perfect absorption of monolayer molybdenum disulfide at visible wavelengths using critical coupling

TL;DR

This paper demonstrates a simple structure that achieves near-perfect visible light absorption in monolayer MoS2 using critical coupling, significantly enhancing efficiency and tunability for optoelectronic applications.

Contribution

It introduces a novel critical coupling approach to significantly improve and tune light absorption in monolayer MoS2, surpassing previous absorption levels.

Findings

Achieves 98.3% light absorption in monolayer MoS2

Absorption can be tuned by adjusting structural parameters

Method applicable to other atomically thin materials

Abstract

A simple perfect absorption structure is proposed to achieve the high efficiency light absorption of monolayer molybdenum disulfide (MoS 2 ) by the critical coupling mechanism of guided resonances. The results of numerical simulation and theoretical analysis show that the light absorption in this atomically thin layer can be as high as 98 . 3% at the visible wavelengths, which is over 12 times more than that of a bare monolayer MoS 2 . In addition, the operating wavelength can be tuned flexibly by adjusting the radius of the air hole and the thickness of the dielectric layers, which is of great practical significance to improve the efficiency and selectivity of the absorption in monolayer MoS 2 . The novel idea of using critical coupling to enhance the light-MoS 2 interaction can be also adopted in other atomically thin materials. And the meaningful improvement and tunability of the absorption in monolayer MoS 2 provide a good prospect for the realization of high-performance MoS 2 -based optoelectronic applications, such as photodetection and photoluminescence.