Topologically protected dynamically controllable multifunctional on-chip integrated photonic circuits

作者：Lin Ding, Jiangle He, Xue Jing, Jun Chen, Yao Jiang, Lifu Liu, Guangxu Su, Peng Zhan, Fanxin Liu · 发表于：Journal of Physics D Applied Physics · 年份：2025 · DOI：10.1088/1361-6463/adebfa · 被引用次数：3 · 研究领域：Neural Networks and Reservoir Computing、Photonic and Optical Devices、Optical Network Technologies

Abstract Extensive research on topological photonics has opened up a revolutionary way to manipulate light or photons, where photonic topological insulators supporting robust localization and dissipationless transport of light are considered promising in on-chip integrated photonic circuit applications. However, the tunability of traditional topological insulators is inevitably limited by the fixed structural parameters and optical characteristics of the material. Here, we propose a strategy to realize topologically protected dynamically controllable multifunctional on-chip integrated photonic circuits based on valley photonic crystals (VPCs) of perforated antimony sulphide (Sb 2 S 3 ). By splicing VPCs with opposite topological phases to form zigzag or bearded interfaces, we demonstrate the various electromagnetic characteristics of the different edge states. Using a combination of different types of valley-locked topological states, we have successfully realized multipath switchable photonic circuits. Due to the thermally adjustable refractive index of Sb 2 S 3 , the robust propagation of light can be dynamically modulated by ambient thermal or optical sources. Moreover, we have simulated the evolution of the device operating frequency region by altering the structural geometric parameters. Our work has great potential in tunable and multifunctional topological photonic circuits.