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Ultrasensitive long-period fiber grating refractive sensor with microcavities

Date
2024
Abstract
We experimentally demonstrate an ultrasensitive refractive index (RI) sensor based on a single-mode fiber (SMF) and long-period fiber grating (LPFG) with periodic microcavities fabricated using a femtosecond laser. The presence of liquid within the microcavities induces a significant modulation in the refractive index, thereby exciting high-order cladding modes. The proposed sensor has obvious merits of easy fabrication and excellent reproducibility and exhibits an ultra-high RI sensitivity of - 11810 nm/RIU with high linearity within the range of 1.334-1.341 RIU. Additionally, it can function as a temperature sensor, presenting broad application prospects in the field of biochemistry.
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Publisher
University of Limerick
Citation
20th Sensors and Their Applications Conference, 2024, Paper No: 28
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20th Sensors & Their Applications Conference
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Keywords
femtosecond laser ablation, long-period fiber grating (LPFG), refractive index (RI) sensor, temperature sensor, Engineering
ULRR Identifiers
https://doi.org/10.34961/researchrepository-ul.29279072
 https://hdl.handle.net/10344/14791
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Funding Information
This work was supported by the National Natural Science Foundation of China (62105077, 62175049, 62275061); Natural Science Foundation of Heilongjiang Province in China (YQ2021F002). Fundamental Research Funds for the Central Universities (3072022TS2501, 3072022CF2505)
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Meetings and Proceedings
Rights
https://creativecommons.org/licenses/by-nc-sa/4.0/
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