Tunable working bandwidth terahertz switch based on magnetic valley photonic crystal

doi:10.1088/1674-1056/adbb5b

中国物理B ›› 2025, Vol. 34 ›› Issue (5): 58702-058702.doi: 10.1088/1674-1056/adbb5b

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

收稿日期:2025-01-11 修回日期:2025-02-20 接受日期:2025-02-28 发布日期:2025-04-28
通讯作者: Hongming Fei E-mail:feihongming@tyut.edu.cn
基金资助:
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).

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

Received:2025-01-11 Revised:2025-02-20 Accepted:2025-02-28 Published:2025-04-28
Contact: Hongming Fei E-mail:feihongming@tyut.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: terahertz switch, magnetic material, valley photonic crystal, tunable bandwidth

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.

Key words: terahertz switch, magnetic material, valley photonic crystal, tunable bandwidth

中图分类号:

87.50.U-

85.70.Ay (Magnetic device characterization, design, and modeling) 42.70.Qs (Photonic bandgap materials) 78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)

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[J]. 中国物理B, 2025, 34(5): 58702-058702.

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[J]. Chin. Phys. B, 2025, 34(5): 58702-058702.

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Tunable working bandwidth terahertz switch based on magnetic valley photonic crystal

Tunable working bandwidth terahertz switch based on magnetic valley photonic crystal

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