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Nature communications
02 12, 2020;11 (1): 847.

Mode-phase-difference photothermal spectroscopy for gas detection with an anti-resonant hollow-core optical fiber.

Pengcheng Zhao, Yan Zhao, Haihong Bao, Hoi Lut Ho, Wei Jin, Shangchun Fan, Shoufei Gao, Yingying Wang, Pu Wang
Author Information
  1. Pengcheng Zhao: School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, 100191, China. ORCID
  2. Yan Zhao: Department of Electrical Engineering and Photonics Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. ORCID
  3. Haihong Bao: Department of Electrical Engineering and Photonics Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. ORCID
  4. Hoi Lut Ho: Department of Electrical Engineering and Photonics Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. ORCID
  5. Wei Jin: Department of Electrical Engineering and Photonics Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. eewjin@polyu.edu.hk.
  6. Shangchun Fan: School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, 100191, China. shangcfan@buaa.edu.cn.
  7. Shoufei Gao: Department of Electrical Engineering and Photonics Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. ORCID
  8. Yingying Wang: Beijing Engineering Research Centre of Laser Technology, Institute of Laser Engineering, Beijing University of Technology, Beijing, 100124, China. ORCID
  9. Pu Wang: Beijing Engineering Research Centre of Laser Technology, Institute of Laser Engineering, Beijing University of Technology, Beijing, 100124, China.
PMID: 32051415 DOI: 10.1038/s41467-020-14707-0

Abstract

Laser spectroscopy outperforms electrochemical and semiconductor gas sensors in selectivity and environmental survivability. However, the performance of the state-of-the-art laser sensors is still insufficient for many high precision applications. Here, we report mode-phase-difference photothermal spectroscopy with a dual-mode anti-resonant hollow-core optical fiber and demonstrate all-fiber gas (acetylene) detection down to ppt (parts-per-trillion) and <1% instability over a period of 3 hours. An anti-resonant hollow-core fiber could be designed to transmit light signals over a broad wavelength range from visible to infrared, covering molecular absorption lines of many important gases. This would enable multi-component gas detection with a single sensing element and pave the way for ultra-precision gas sensing for medical, environmental and industrial applications.

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