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Ultra-sensitive all-fibre photothermal spectroscopy with large dynamic range

Author

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  • Wei Jin

    (The Hong Kong Polytechnic University, Hung Hom, Kowloon
    Photonic Sensors Research Center, The Hong Kong Polytechnic University Shenzhen Research Institute)

  • Yingchun Cao

    (The Hong Kong Polytechnic University, Hung Hom, Kowloon
    Photonic Sensors Research Center, The Hong Kong Polytechnic University Shenzhen Research Institute
    Present address: Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, USA.)

  • Fan Yang

    (The Hong Kong Polytechnic University, Hung Hom, Kowloon
    Photonic Sensors Research Center, The Hong Kong Polytechnic University Shenzhen Research Institute)

  • Hoi Lut Ho

    (The Hong Kong Polytechnic University, Hung Hom, Kowloon
    Photonic Sensors Research Center, The Hong Kong Polytechnic University Shenzhen Research Institute)

Abstract

Photothermal interferometry is an ultra-sensitive spectroscopic means for trace chemical detection in gas- and liquid-phase materials. Previous photothermal interferometry systems used free-space optics and have limitations in efficiency of light–matter interaction, size and optical alignment, and integration into photonic circuits. Here we exploit photothermal-induced phase change in a gas-filled hollow-core photonic bandgap fibre, and demonstrate an all-fibre acetylene gas sensor with a noise equivalent concentration of 2 p.p.b. (2.3 × 10−9 cm−1 in absorption coefficient) and an unprecedented dynamic range of nearly six orders of magnitude. The realization of photothermal interferometry with low-cost near infrared semiconductor lasers and fibre-based technology allows a class of optical sensors with compact size, ultra sensitivity and selectivity, applicability to harsh environment, and capability for remote and multiplexed multi-point detection and distributed sensing.

Suggested Citation

  • Wei Jin & Yingchun Cao & Fan Yang & Hoi Lut Ho, 2015. "Ultra-sensitive all-fibre photothermal spectroscopy with large dynamic range," Nature Communications, Nature, vol. 6(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7767
    DOI: 10.1038/ncomms7767
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    Cited by:

    1. Qiang Wang & Zhen Wang & Hui Zhang & Shoulin Jiang & Yingying Wang & Wei Jin & Wei Ren, 2022. "Dual-comb photothermal spectroscopy," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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