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Title: Ultra-sensitive all-fibre photothermal spectroscopy with large dynamic range
Authors: Jin, W 
Cao, Y
Yang, F
Ho, HL 
Issue Date: 2015
Source: Nature Communications, 13 2015, v. 6, no. , p. 1-8
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.
Publisher: Nature Publishing Group
Journal: Nature Communications 
EISSN: 2041-1723
DOI: 10.1038/ncomms7767
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
© 2015 Macmillan Publishers Limited. All rights reserved.
The following publication Jin, W., Cao, Y., Yang, F. et al. Ultra-sensitive all-fibre photothermal spectroscopy with large dynamic range. Nat Commun 6, 6767 (2015) is available at https://dx.doi.org/10.1038/ncomms7767
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