2023/07/24 by Yongqi Chen, Chen, Yongqi, Nan Gao +5
Materials Science · Physics and Astronomy · #78-10 #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Metamaterials and Metasurfaces Applications #Optics (physics.optics) #Photonic Crystals and Applications #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2307.12495
openalex publication_date 2023/07/24 · openalex created_date 2023/07/26 · openalex updated_date 2026/07/28
We explore a hexagonal cavity that supports chiral topological whispering gallery (CTWG) modes, formed by a gyromagnetic photonic crystal. This mode is a special type of topologically protected optical mode that can propagate in photonic crystals with chiral direction. Finite element method simulations show that discrete edge states exist in the topological band gap due to the coupling of chiral edge states and WG modes. Since the cavity only supports edge state modes with group velocity in only one direction, it can purely generate traveling modes and be immune to interference modes. In addition, we introduced defects and disorder to test the robustness of the cavity, demonstrating that the CTWG modes can be effectively maintained under all types of perturbations. Our topological cavity platform offers useful prototype of robust topological photonic devices. The existence of this mode can have important implications for the design and application of optical devices.