Realization of multifunctional optical devices based on valley topological photonic crystals with triangular lattice

作     者：Gao, Yong-Feng Sun, Ming-Yang Yao, Tian-Hao Li, Sheng-Yi Zhou, Shu-Yang Yang, Ming Hou, Qi-Chao 

作者机构：Jiangsu Univ Sch Mech Engn Zhenjiang 212013 Peoples R China Shandong Univ State Key Lab Crystal Mat Jinan 250100 Peoples R China Shanghai Jiao Tong Univ State Key Lab Adv Opt Commun Syst & Networks Shanghai 200240 Peoples R China Hunan Univ Coll Mech & Vehicle Engn Natl Engn Res Ctr High Efficiency Grinding Changsha 410082 Peoples R China 

出 版 物：《OPTICS COMMUNICATIONS》 (Opt Commun)

年 卷 期：2025年第579卷

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：State Key Laboratory of Crystal Materials, SKLCM State Key Laboratory of Advanced Optical Communication Systems and Networks of Shanghai Jiao Tong University, (2024GZKF005) Shandong University, SDU, (KF2312) Jiangsu University, JSU, (23A004, 202410299617X, 23A011, 202410299597X) National Natural Science Foundation of China, NSFC, (12104508) 

主　　题：Triangular valley photonic crystals Topological edge and corner states Frequency dividers Light routers Logic gates 

摘      要：The emergence of valley Hall topological photonic crystals (VPCs) has driven advancements in the field of optical applications such as optical communication and optical computing. In this work, we propose valley photonic crystals with triangular lattice composed of silicon rods to achieve topological edge states (TESs) and topological corner states (TCSs), and investigate the influence of two different domain interfaces of bearded-shaped and zigzag-shaped between two VPCs with opposite valley Chern numbers on TESs and TCSs. TESs and TCSs obtained from different interfaces have different frequencies and the robustness of them to defects is demonstrated. A rhomboidal hybrid structure with various valley interfaces is designed to achieve the functions of frequency division, beam splitting and three-channel photonic router based on TESs. In addition, a rhomboidal hybrid VPC waveguide-cavity coupling system is proposed, which comprises a Y-shaped air waveguide and two triangular box-shaped cavities with different domain interfaces. Both AND gate and OR gate logic gate functionalities can be achieved in the same structure corresponding to different frequency ranges by the coupling of air waveguides and box-shaped cavities utilizing the strong localization of corner states. This work provides a new approach for integrated devices, particularly in the fields of integrated circuits and integrated photonic devices, based on triangular photonic crystals.