High-sensitive refractive index sensor based on the long-period gratings inscribed in the tapered fiber at dispersion turning point

被引：5

作者：

Chen, Long ^{[1
]}

Ma, Yuehui ^{[1
]}

Jiang, Chen ^{[2
,3
]}

Chen, Siyu ^{[1
]}

Wu, Meng ^{[1
]}

Zhang, Weidong ^{[1
]}

Mou, Chengbo ^{[1
]}

Liu, Yunqi ^{[1
]}

机构：

[1] Shanghai Univ, Shanghai Inst Adv Commun & Data Sci, Key Lab Specialty Fiber Opt & Opt Access Networks, Joint Int Res Lab Specialty Fiber Opt & Adv Commun, Shanghai 200444, Peoples R China

[2] Nanjing Univ Posts & Telecommun, Adv Photon Technol Lab, Coll Elect & Opt Engn, Nanjing 210023, Peoples R China

[3] Nanjing Univ Posts & Telecommun, Coll Flexible Elect Future Technol, Nanjing 210023, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2024年 / 569卷

基金：

中国国家自然科学基金;

关键词：

MODE; TRANSITION; LEVEL;

D O I：

10.1016/j.optcom.2024.130798

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrated the fabrication of long -period fiber gratings (LPFGs) in the tapered single -mode fiber by CO 2 laser. The phase -matching curves of the LPFGs inscribed in the tapered fiber with different waist diameters have been studied theoretically and experimentally. When the waist diameter of the tapered fiber decreased from 90 pm to 22 pm, the slope of the phase -matching curve changed dramatically. The refractive index sensitivity can be increased by inscribing the LPFGs in the tapered fiber around the dispersion turning point. A maximum refractive index sensitivity of 21702.78 nm/RIU has been achieved in the range of 1.445-1.457 for the LPFG inscribed in the tapered fiber with a waist diameter of 50 pm. This kind of LPFGs inscribing in the tapered fiber may be a good candidate for the development of refractive index based chemical and biological sensors.

引用

页数：8

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