Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31934
Title: Ultra-sensitive all-fibre photothermal spectroscopy with large dynamic range
Authors: Jin, W 
Cao, Y
Yang, F
Ho, HL 
Issue Date: 2015
Publisher: Nature Publishing Group
Source: Nature communications, 2015, v. 6, 6767 How to cite?
Journal: Nature Communications 
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 ¡Ñ 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.
URI: http://hdl.handle.net/10397/31934
EISSN: 2041-1723
DOI: 10.1038/ncomms7767
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