Evanescent Wave Lab-on-Fiber for High Sensitivity Gas Spectroscopy with Wide Dynamic Range and Long-Term Stability

被引：6
|
作者：
Zhao, Pengcheng [1 ,2 ,3 ]
Ho, Hoi Lut [1 ,2 ,3 ]
Fan, Shangchun [4 ,5 ]
Jin, Wei [1 ,2 ,3 ]
机构：
[1] Hong Kong Polytech Univ, Dept Elect Engn, Hong Kong 999077, Peoples R China
[2] Hong Kong Polytech Univ, Photon Res Inst, Hong Kong 999077, Peoples R China
[3] Hong Kong Polytech Univ, Photon Res Ctr, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
[4] Beihang Univ, Sch Instrumentat & Optoelect Engn, Beijing 100191, Peoples R China
[5] Hong Kong Polytech Univ, Photon Res Inst, Hong Kong 999077, Peoples R China
来源：
LASER & PHOTONICS REVIEWS | 2023年 / 17卷 / 05期
基金：
中国国家自然科学基金;
关键词：
evanescent wave; gas spectroscopy; lab-on-fiber; micro; nano waveguides; ABSORPTION-SPECTROSCOPY;
D O I：
10.1002/lpor.202200972
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Micro/nano waveguide has been widely exploited for gas sensing due to its strong confinement of evanescent field, compact size, and fast response. However, the state-or-the-art evanescent-wave gas sensors still struggle to satisfy the requirements of high sensitivity, high selectivity, large dynamic range, and long-term stability. In this work, microfiber-based evanescent-wave mode-phase-difference photothermal spectroscopy for trace gas detection is reported. With a microfiber of 5.6 cm in length and 2.36 mu m in diameter, noise-equivalent-concentration of 160 ppb methane in nitrogen is achieved with a dynamic range over 6 orders of magnitude, response time of less than 6 s, and <3% instability over 7 days. The technique utilizes commercial fiber-optic components to make cost-effective lab-on-fiber probes with real-time and remote detection capability for industrial, medical, and environmental monitoring.
引用
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页数：7
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