Ultrasensitive Refractive Sensor Based on Femtosecond Laser Inscribed Long-Period Fiber Grating With a Few Microcavities

被引：7

作者：

Gao, Shan ^{[1
]}

Liu, Yan ^{[1
]}

Yang, Jing ^{[1
]}

Duan, Zhenyu ^{[1
]}

Yin, Taian ^{[1
]}

Liu, Zhihai ^{[1
]}

Shi, Jinhui ^{[1
]}

Yuan, Libo ^{[1
]}

Guan, Chunying ^{[1
]}

机构：

[1] Harbin Engn Univ, Coll Phys & Optoelect Engn, Harbin 150001, Peoples R China

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2024年 / 42卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Microcavities; Optical fiber sensors; Fiber lasers; Optical fiber couplers; Laser modes; Gratings; Claddings; Femtosecond laser ablation; long-period fiber grating (LPFG); refractive index (RI) sensor; ORDER CLADDING MODE; CORE FIBER; INDEX; SENSITIVITY; INTERFEROMETER;

D O I：

10.1109/JLT.2023.3321787

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We experimentally demonstrate a single mode fiber (SMF) ultrasensitive refractive index (RI) sensor based on long-period fiber grating (LPFG) with periodic microcavities fabricated by femtosecond laser. The liquid in the microcavities causes a strong RI modulation to excite the high-order cladding modes. The proposed sensor can operate in reflection mode by coating the end face of the fiber with gold film, as a result a cascade LPFG structure is equivalently formed to increase the contrast of the resonance dip. The LPFG has an ultra-high RI sensitivity of -12576 nm/RIU with a high linearity in the range of 1.3335-1.3430 RIU and a low temperature cross talk. The sensor has promising applications in biochemical or biomedical industries.

引用

页码：1696 / 1701

页数：6

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