Photothermal CO detection in a hollow-core negative curvature fiber

被引：53

作者：

Yao, Chenyu ^{[1
]}

Wang, Qiang ^{[1
]}

Lin, Yuechuan ^{[2
]}

Jin, Wei ^{[2
]}

Xiao, Limin ^{[3
]}

Gao, Shoufei ^{[4
]}

Wang, Yingying ^{[4
]}

Wang, Pu ^{[4
]}

Ren, Wei ^{[1
]}

机构：

[1] Chinese Univ Hong Kong, Dept Mech & Automat Engn, Hong Kong, Peoples R China

[2] Hong Kong Polytech Univ, Dept Elect Engn, Hong Kong, Peoples R China

[3] Fudan Univ, Adv Fiber Devices & Syst Grp, Key Lab Micro & Nano Photon Struct MoE, Key Lab Informat Sci Electromagnet Waves MoE,Shan, Shanghai 200433, Peoples R China

[4] Beijing Univ Technol, Beijing Engn Res Ctr Laser Technol, Inst Laser Engn, Beijing 100124, Peoples R China

来源：

OPTICS LETTERS | 2019年 / 44卷 / 16期

关键词：

TRANSMISSION;

D O I：

10.1364/OL.44.004048

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate the first, to the best of our knowledge, photothermal carbon monoxide (CO) sensor using a hollow-core negative curvature fiber. The hollow-core fiber features a typical structure of one ring cladding containing eight non-touching capillaries to form a negative curvature core-surround. The photothermal effect in a 40-mu m hollow core is induced by CO absorption at 2327 nm and detected by a Mach-Zehnder interferometer operating at 1533 nm. By using wavelength modulation spectroscopy, we achieve a normalized noise equivalent absorption coefficient of 4.4 x 10(-8) cm(-1) WHz-1/2. As CO has a very slow vibrational-translational relaxation process, we enhance the photothermal signal by enhancing the relaxation with the water vapor additive. (C) 2019 Optical Society of America.

引用

页码：4048 / 4051

页数：4

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