摘要
拓扑光子学的研究在光学通信领域具有重要的研究意义。为了实现拓扑边界态和角态,基于Su-Schrieffer-Heeger(SSH)模型,构建了二维正方形光子晶体结构,通过有限元软件仿真计算了该结构的能带,分析了对应的模式和拓扑相位。在此基础上实现了具有拓扑保护性质的边界态和角态,产生了相对带隙宽度为35%的较宽带隙,并通过频域仿真,验证了拓扑边界态具有单向传输特性和抗干扰的能力,拓扑角态能够把光波约束在角点的位置。结果表明:基于SSH模型设计的光子晶体结构能够实现高性能的拓扑边界态和角态,具有设计简单,容易实现的特点。
The study of topological photonics is of great significance in the field of optical communication. In order to achieve topological edge states(TESs) and corner states(TCSs), a two-dimensional square photonic crystal structure was constructed based on the Su-Schrieffer-Heeger(SSH) model. The energy bands of the structure were simulated and calculated using finite element software, and the corresponding modes and topological phases were analyzed. On this basis, edge states and corner states with topological protection properties were implemented, resulting in a relatively wider bandgap with a relative bandgap width of 35%. The unidirectional transmission characteristics and anti-interference ability of topological boundary states were verified through frequency domain simulation. Topological corner states can constrain light waves at corner positions. The results show that the photonic crystal structure based on the SSH model can achieve topological edge states and corner states with good performance. The structure is simple and easily realized.
作者
卜凡
王涛
郑任嗣
庄丽珊
方云团
BU Fan;WANG Tao;ZHENG Rensi;ZHUANG Lishan;FANG Yuntuan(School of Computer Science and Telecommunication Engineering,Jiangsu University,Zhenjiang 212013,China)
出处
《光学技术》
CAS
CSCD
北大核心
2024年第1期94-98,共5页
Optical Technique
基金
江苏省研究生科研与实践创新计划项目(KYCX23_3684)
江苏省高等学校大学生创新创业训练计划项目(202210299175Y)。
