中国物理B ›› 2022, Vol. 31 ›› Issue (12): 124202-124202.doi: 10.1088/1674-1056/ac92d5

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Enhancing terahertz photonic spin Hall effect via optical Tamm state and the sensing application

Jie Cheng(程杰)1,†, Jiahao Xu(徐家豪)2, Yinjie Xiang(项寅杰)1, Shengli Liu(刘胜利)1, Fengfeng Chi(迟逢逢)1, Bin Li(李斌)1, and Peng Dong(董鹏)3,‡   

  1. 1 School of Science, New Energy Technology Engineering Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    2 College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    3 School of Electrical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China
  • 收稿日期:2022-06-07 修回日期:2022-09-13 接受日期:2022-09-19 出版日期:2022-11-11 发布日期:2022-11-11
  • 通讯作者: Jie Cheng, Peng Dong E-mail:chengj@njupt.edu.cn;2021101298@niit.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12175107 and 12004194) and the Natural Science Foundation of Nanjing University of Posts and Telecommunications (Grant No. NY220030).

Enhancing terahertz photonic spin Hall effect via optical Tamm state and the sensing application

Jie Cheng(程杰)1,†, Jiahao Xu(徐家豪)2, Yinjie Xiang(项寅杰)1, Shengli Liu(刘胜利)1, Fengfeng Chi(迟逢逢)1, Bin Li(李斌)1, and Peng Dong(董鹏)3,‡   

  1. 1 School of Science, New Energy Technology Engineering Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    2 College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    3 School of Electrical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China
  • Received:2022-06-07 Revised:2022-09-13 Accepted:2022-09-19 Online:2022-11-11 Published:2022-11-11
  • Contact: Jie Cheng, Peng Dong E-mail:chengj@njupt.edu.cn;2021101298@niit.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12175107 and 12004194) and the Natural Science Foundation of Nanjing University of Posts and Telecommunications (Grant No. NY220030).

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摘要： The photonic spin Hall effect (PSHE), characterized by two splitting beams with opposite spins, has great potential applications in nano-photonic devices, optical sensing fields, and precision metrology. We present the significant enhancement of terahertz (THz) PSHE by taking advantage of the optical Tamm state (OTS) in InSb-distributed Bragg reflector (DBR) structure. The spin shift of reflected light can be dynamically tuned by the structural parameters (e.g. the thickness) of the InSb-DBR structure as well as the temperature, and the maximum spin shift for a horizontally polarized incident beam at 1.1 THz can reach up to 11.15 mm. Moreover, we propose a THz gas sensing device based on the enhanced PSHE via the strong excitation of OTS for the InSb-DBR structure with a superior intensity sensitivity of 5.873×104 mm/RIU and good stability. This sensor exhibits two orders of magnitude improvement compared with the similar PSHE sensor based on InSb-supported THz long-range surface plasmon resonance. These findings may provide an alternative way for the enhanced PSHE and offer the opportunity for developing new optical sensing devices.

关键词: photonic spin Hall effect, optical Tamm state, InSb, gas sensor

Abstract: The photonic spin Hall effect (PSHE), characterized by two splitting beams with opposite spins, has great potential applications in nano-photonic devices, optical sensing fields, and precision metrology. We present the significant enhancement of terahertz (THz) PSHE by taking advantage of the optical Tamm state (OTS) in InSb-distributed Bragg reflector (DBR) structure. The spin shift of reflected light can be dynamically tuned by the structural parameters (e.g. the thickness) of the InSb-DBR structure as well as the temperature, and the maximum spin shift for a horizontally polarized incident beam at 1.1 THz can reach up to 11.15 mm. Moreover, we propose a THz gas sensing device based on the enhanced PSHE via the strong excitation of OTS for the InSb-DBR structure with a superior intensity sensitivity of 5.873×104 mm/RIU and good stability. This sensor exhibits two orders of magnitude improvement compared with the similar PSHE sensor based on InSb-supported THz long-range surface plasmon resonance. These findings may provide an alternative way for the enhanced PSHE and offer the opportunity for developing new optical sensing devices.

Key words: photonic spin Hall effect, optical Tamm state, InSb, gas sensor

中图分类号:  (Wave optics)

  • 42.25.-p
41.20.Jb (Electromagnetic wave propagation; radiowave propagation) 42.79.-e (Optical elements, devices, and systems) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))