Low-Threshold and Tunable Optical Bistability Based on Topological Edge State in One-Dimensional Photonic Crystal Heterostructure With Graphene
Low-Threshold and Tunable Optical Bistability Based on Topological Edge State in One-Dimensional Photonic Crystal Heterostructure With Graphene
复制标题
基于石墨烯一维光子晶体异质结构拓扑边缘态的低阈值可调光学双稳态
DOI：
10.1109/access.2020.3034320
复制
发表时间：
2020-01-01
期刊：
影响因子：
3.9
通讯作者：
Jiang, Leyong
中科院分区：
文献类型：
--
作者：
Peng, Yuxiang;Xu, Jiao;Jiang, Leyong
在本文中，我们对太赫兹频率范围内石墨烯基一维光子晶体异质结构中透射光束的光学双稳态现象进行了理论分析。这种低阈值光学双稳态源于由于两个所提出的一维光子晶体之间的界面处的拓扑边缘态的激发而导致的局域电场的增强。计算和仿真结果表明，通过改变石墨烯的外加电压可以连续调节迟滞行为和光学双稳态阈值。此外，该结构的光学双稳定性也可以通过入射光的角度和石墨烯层的数量来改变。我们的研究结果为实现太赫兹范围内低阈值和可调谐光学双稳态提供了一种新方法，在全光开关和其他光学双稳态器件领域具有良好的应用前景。
In this article, we present a theoretical analysis of the optical bistability phenomenon of the transmitted light beam in a graphene-based one-dimensional photonic crystal heterostructure in terahertz frequency range. This low-threshold optical bistability originates from the enhancement of the local electric field owing to the excitation of topological edge state at the interface between the two proposed one-dimensional photonic crystals. The results of calculation and simulation show that the hysteretic behavior and the threshold of optical bistability can be adjusted continuously by changing the applied voltage of the graphene. Moreover, the optical bistability of this structure also can be modified by the angle of the incident light and the number of graphene layers. Our findings provide a new method for realizing low threshold and tunable optical bistability in terahertz range, indicating excellent application prospects in the field of all-optical switches and other optical bistable devices.