中国物理B ›› 2023, Vol. 32 ›› Issue (1): 14204-014204.doi: 10.1088/1674-1056/ac6338

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Design of a coated thinly clad chalcogenide long-period fiber grating refractive index sensor based on dual-peak resonance near the phase matching turning point

Qianyu Qi(齐倩玉)1,2, Yaowei Li(李耀威)1,2, Ting Liu(刘婷)1,2, Peiqing Zhang(张培晴)1,2,3,†, Shixun Dai(戴世勋)1,2,3, and Tiefeng Xu(徐铁峰)1,4   

  1. 1 Laboratory of Infrared Material and Devices, Advanced Technology Research Institute, Ningbo University, Ningbo 315211, China;
    2 Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo 315211, China;
    3 Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, China;
    4 Ningbo Institute of Oceanography, Ningbo 315832, China
  • 收稿日期:2022-01-13 修回日期:2022-03-13 接受日期:2022-04-01 出版日期:2022-12-08 发布日期:2022-12-08
  • 通讯作者: Peiqing Zhang E-mail:zhangpeiqing@nbu.edu.cn
  • 基金资助:
    Project supported by the Natural Science Foundation of China (Grant Nos. 62075107, 61935006, 62090064, and 62090065) and K. C. Wong Magna Fund in Ningbo University.

Design of a coated thinly clad chalcogenide long-period fiber grating refractive index sensor based on dual-peak resonance near the phase matching turning point

Qianyu Qi(齐倩玉)1,2, Yaowei Li(李耀威)1,2, Ting Liu(刘婷)1,2, Peiqing Zhang(张培晴)1,2,3,†, Shixun Dai(戴世勋)1,2,3, and Tiefeng Xu(徐铁峰)1,4   

  1. 1 Laboratory of Infrared Material and Devices, Advanced Technology Research Institute, Ningbo University, Ningbo 315211, China;
    2 Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo 315211, China;
    3 Engineering Research Center for Advanced Infrared Photoelectric Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, China;
    4 Ningbo Institute of Oceanography, Ningbo 315832, China
  • Received:2022-01-13 Revised:2022-03-13 Accepted:2022-04-01 Online:2022-12-08 Published:2022-12-08
  • Contact: Peiqing Zhang E-mail:zhangpeiqing@nbu.edu.cn
  • Supported by:
    Project supported by the Natural Science Foundation of China (Grant Nos. 62075107, 61935006, 62090064, and 62090065) and K. C. Wong Magna Fund in Ningbo University.

摘要: A novel method for designing chalcogenide long-period fiber grating (LPFG) sensors based on the dual-peak resonance effect of the LPFG near the phase matching turning point (PMTP) is presented. Refractive index sensing in a high-refractive-index chalcogenide fiber is achieved with a coated thinly clad film. The dual-peak resonant characteristics near the PMTP and the refractive index sensing properties of the LPFG are analyzed first by the phase-matching condition of the LPFG. The effects of film parameters and cladding radius on the sensitivity of refractive index sensing are further discussed. The sensor is optimized by selecting the appropriate film parameters and cladding radius. Simulation results show that the ambient refractive index sensitivity of a dual-peak coated thinly clad chalcogenide LPFG at the PMTP can be 2400 nm/RIU, which is significantly higher than that of non-optimized gratings. It has great application potential in the field of chemical sensing and biosensors.

关键词: chalcogenide longperiod fiber grating, dual-peak resonance, phase matching turning point, refractive index sensor

Abstract: A novel method for designing chalcogenide long-period fiber grating (LPFG) sensors based on the dual-peak resonance effect of the LPFG near the phase matching turning point (PMTP) is presented. Refractive index sensing in a high-refractive-index chalcogenide fiber is achieved with a coated thinly clad film. The dual-peak resonant characteristics near the PMTP and the refractive index sensing properties of the LPFG are analyzed first by the phase-matching condition of the LPFG. The effects of film parameters and cladding radius on the sensitivity of refractive index sensing are further discussed. The sensor is optimized by selecting the appropriate film parameters and cladding radius. Simulation results show that the ambient refractive index sensitivity of a dual-peak coated thinly clad chalcogenide LPFG at the PMTP can be 2400 nm/RIU, which is significantly higher than that of non-optimized gratings. It has great application potential in the field of chemical sensing and biosensors.

Key words: chalcogenide longperiod fiber grating, dual-peak resonance, phase matching turning point, refractive index sensor

中图分类号:  (Propagation, transmission, attenuation, and radiative transfer)

  • 42.68.Ay
42.81.-i (Fiber optics) 42.25.Dd (Wave propagation in random media) 42.81.Pa (Sensors, gyros)