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

被引：2
作者：
Qi, Qianyu [1 ,2 ]
Li, Yaowei [1 ,2 ]
Liu, Ting [1 ,2 ]
Zhang, Peiqing [1 ,2 ,3 ]
Dai, Shixun [1 ,2 ,3 ]
Xu, Tiefeng [1 ,4 ]
机构：
[1] Ningbo Univ, Adv Technol Res Inst, Lab Infrared Mat & Devices, Ningbo 315211, Peoples R China
[2] Key Lab Photoelect Detect Mat & Devices Zhejiang P, Ningbo 315211, Peoples R China
[3] Ningbo Univ, Engn Res Ctr Adv Infrared Photoelect Mat & Devices, Ningbo 315211, Peoples R China
[4] Ningbo Inst Oceanog, Ningbo 315832, Peoples R China
来源：
CHINESE PHYSICS B | 2023年 / 32卷 / 01期
关键词：
chalcogenide longperiod fiber grating; dual-peak resonance; phase matching turning point; refractive index sensor; SENSITIVITY CHARACTERISTICS; CHEMICAL SENSOR; DISPERSION; TEMPERATURE;
D O I：
10.1088/1674-1056/ac6338
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
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.
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页数：7
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