Low-threshold optical bistable device based on photonic crystal topological state

Abstract

The invention discloses a low-threshold optical bistable device based on a photonic crystal topological state. The low threshold optical bistable device based on the photonic crystal topology state isformed by combining two different kinds of photonic crystals PC1 and PC2 with a single layer of graphene, the photonic crystals PC1 and PC2 are are formed by periodically and alternatively arraying media a and media b, and the graphene layer is located on an interface of the photonic crystals PC1 and PC2. According to the low-threshold optical bistable device based on the photonic crystal topological state, graphene with continuous and adjustable conductivity and strong third-order nonlinear conductivity characteristics is adopted, thus the optical bistable device has the advantages that thedynamism is adjustable, and the threshold value is low, and the low threshold optical bistable device based on the photonic crystal topology state can be applied to manufacturing of an all-optical logic gate, an optical logic device, an optical modulator, an optical switch, and the like.

Description

technical field [0001] The invention relates to an optical bistable device, in particular to a low-threshold optical bistable device based on photonic crystal topological state. Background technique [0002] Since Gibbs et al. discovered optical bistability in experiments, in the past few decades, people have proposed various approaches and methods to realize the generation and control of optical bistability. Optical bistability refers to the multivalued phenomenon similar to the hysteresis loop between the output light intensity and the input light intensity of the nonlinear optical system. It has two different output states, high and low, and these two states can be controlled by optical signals, so it is widely used in a wide range of fields such as all-optical switches, optical logic devices, optical modulators, and optical storage. [0003] Although the current basic theory of optical bistability has been relatively perfect, it is still difficult to produce practical, ...

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Problems solved by technology

[0003] Although the current basic theory of optical bistability has been relatively perfect, it is still difficult to produce practical, low-threshold and dynamically controllable optical bistable devices.

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