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

Wei Jin (), Yingchun Cao, Fan Yang and Hoi Lut Ho
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Wei Jin: The Hong Kong Polytechnic University, Hung Hom, Kowloon
Yingchun Cao: The Hong Kong Polytechnic University, Hung Hom, Kowloon
Fan Yang: The Hong Kong Polytechnic University, Hung Hom, Kowloon
Hoi Lut Ho: The Hong Kong Polytechnic University, Hung Hom, Kowloon

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7767

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