Tunable working bandwidth terahertz switch based on magnetic valley photonic crystal
Mingxia Hou(侯铭霞)1,3, Hongming Fei(费宏明)1,2,3,†, Han Lin(林瀚)4, and Mingda Zhang(张明达)1,3
1 College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China; 2 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan 030006, China; 3 Shanxi Key Laboratory of Precision Measurement Physics, Taiyuan University of Technology, Taiyuan 030024, China; 4 Centre for Atomaterials and Nanomanufacturing, School of Science, RMIT University, Melbourne, Victoria 3000, Australia
Abstract Terahertz (THz) switches are essential components of THz communication systems. THz switches based on conventional waveguides and photonic crystal structures are sensitive to manufacturing defects and sharp bending, resulting in high scattering losses. In addition, THz switches with tunable working bandwidths have not yet been demonstrated. Here, we design THz switches based on a topological valley photonic crystal (VPC) structure using magnetic materials, which can achieve high forward transmittance based on the unique spin-valley locking effect. The broad working bandwidth allows selective turning on and off at a designed wavelength region by controlling the applied magnetic field. The designed THz switch can achieve an extinction ratio of up to 31.66 dB with an insertion loss of less than 0.13 dB. The 3-dB bandwidth is up to 49 GHz. This tunable THz switch can be experimentally fabricated by current fabrication techniques and thus can find broad applications in THz communication systems.
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1404201), Australia Research Council (Grant Nos. DP220100603 and FT220100559), the National Natural Science Foundation of China (Grant No. U23A20375), the Natural Science Foundation of Shanxi Province (Grant No. 202403021211011), Research Project Supported by Shanxi Scholarship Council of China (Grant No. 2024-032), Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (Grant No. 20240006), the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices (Grant No. KF202402), Basic Scientific Research Conditions and Major Scientific Instrument and Equipment Development of Anhui Science and Technology Department (Grant No. 2023YFF0715700), Key Research Project of Shanxi Province (Grant No. 202302150101001), and Linkage Project Scheme (Grant Nos. LP210200345 and LP210100467).
Mingxia Hou(侯铭霞), Hongming Fei(费宏明), Han Lin(林瀚), and Mingda Zhang(张明达) Tunable working bandwidth terahertz switch based on magnetic valley photonic crystal 2025 Chin. Phys. B 34 058702
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