Low threshold optical bistability based on MoS2 in asymmetric Fabry-Perot cavity structure in visible light band

TL;DR

This paper theoretically demonstrates low threshold optical bistability in a MoS2-based asymmetric Fabry-Perot cavity within the visible spectrum, driven by MoS2's nonlinear properties and cavity resonance effects.

Contribution

It introduces a novel multi-layer asymmetric Fabry-Perot cavity structure utilizing MoS2 for low threshold optical bistability in the visible band.

Findings

Optical bistability threshold is on the order of a unit in the visible band.

Bistability behavior varies with incident light direction and system parameters.

Bistability is influenced by wavelength, cavity length, and dielectric refractive index.

Abstract

This article theoretically proposes a multi-layer Fabry-Perot cavity structure based on nonlinear MoS2, whose cavity is composed of asymmetric photonic crystals. In this structure, we observed a low threshold optical bistability phenomenon on the order of a in the visible light band, which is caused by the large third-order nonlinear conductivity of the bilayer MoS2 and the Fabry-Perot cavity resonance. Research has found that when light is incident from two different directions in an asymmetric Fabry-Perot cavity, the optical bistability exhibits not exactly the same behavior. In addition, we further investigated and found that the optical bistability behavior in this simple multi-layer structure is closely related to parameters such as incident wavelength, Fabry-Perot cavity length, and refractive index of the photonic crystal dielectric. This work provides a new approach for the implementation of low threshold optical bistable devices in the visible light band, which is expected to be applied in nonlinear optical fields such as all optical switches and all optical logic devices.