Optical modulators with two-dimensional layered materials

TL;DR

This review discusses recent advances in optical modulators using two-dimensional layered materials like graphene and transition metal dichalcogenides, highlighting their potential for high-performance, broadband, and integrated photonic applications.

Contribution

It provides a comprehensive overview of the state-of-the-art in 2D material-based optical modulators, including hybrid structures and future research directions.

Findings

2D materials enable superior light modulation performance.

Hybrid structures enhance modulation capabilities.

Future mechanisms like magneto-optic effects show promise.

Abstract

Light modulation is an essential operation in photonics and optoelectronics. With existing and emerging technologies increasingly demanding compact, efficient, fast and broadband optical modulators, high-performance light modulation solutions are becoming indispensable. The recent realization that two-dimensional layered materials could modulate light with superior performance has prompted intense research and significant advances, paving the way for realistic applications. In this review, we cover the state-of-the-art of optical modulators based on two-dimensional layered materials including graphene, transition metal dichalcogenides and black phosphorus. We discuss recent advances employing hybrid structures, such as two-dimensional heterostructures, plasmonic structures, and silicon/fibre integrated structures. We also take a look at future perspectives and discuss the potential of yet relatively unexplored mechanisms such as magneto-optic and acousto-optic modulation.