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Nonlinear gas sensing based on third-harmonic generation in cascaded chalcogenide microfibers

Nonlinear gas sensing based on third-harmonic generation in cascaded chalcogenide microfibers
Nonlinear gas sensing based on third-harmonic generation in cascaded chalcogenide microfibers

The performance of conventional gas sensors based on light absorption in the mid-infrared (MIR) faces the challenges of the high cost and low efficiency of photodetection at these wavelengths. In this paper, a nonlinear gas sensor based on third-harmonic generation (THG) in cascaded chalcogenide microfibers is proposed. In the first microfiber section, the input MIR light with “fingerprint” frequency has shown the ability for a large amount of gas absorption. The second microfiber section is used for THG pumped by the residual MIR light. In this process, the sensing signal is converted to the near-infrared region, and the power variation caused by the absorption is amplified due to the nonlinear relation between pump and harmonic signals. According to our analysis, the lowest methane concentration of 7.4 × 10−8 can be detected at a practically drawable Ae2Se3 microfiber length of 1 cm. Compared to direct MIR gas sensing, cascaded microfiber sensing has the advantages of improved sensing performance and also shorter absorption length.

0740-3224
300-305
Huang, Pan
c5f979dd-91ad-46fb-a027-4b3af8989ace
Huang, Tianye
802c90e3-cb40-4cf2-82f5-ef60d2169bf4
Zeng, Shuwen
2810df72-f064-4c46-b6ab-790595ef866a
Pan, Jianxing
96318e81-826a-40c3-8a54-4b7d550b0072
Wu, Xu
fe9d1682-b930-423b-8003-b5165b9b9082
Zhao, Xiang
b2557f12-3eaf-434e-b3a5-8157385dc532
Wu, Yiheng
c2ac4eec-ffff-4242-99fe-a048f0ac330b
Ping, Perry Shum
ca8d6589-7878-4219-b2f7-09866a52e2d6
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Huang, Pan
c5f979dd-91ad-46fb-a027-4b3af8989ace
Huang, Tianye
802c90e3-cb40-4cf2-82f5-ef60d2169bf4
Zeng, Shuwen
2810df72-f064-4c46-b6ab-790595ef866a
Pan, Jianxing
96318e81-826a-40c3-8a54-4b7d550b0072
Wu, Xu
fe9d1682-b930-423b-8003-b5165b9b9082
Zhao, Xiang
b2557f12-3eaf-434e-b3a5-8157385dc532
Wu, Yiheng
c2ac4eec-ffff-4242-99fe-a048f0ac330b
Ping, Perry Shum
ca8d6589-7878-4219-b2f7-09866a52e2d6
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8

Huang, Pan, Huang, Tianye, Zeng, Shuwen, Pan, Jianxing, Wu, Xu, Zhao, Xiang, Wu, Yiheng, Ping, Perry Shum and Brambilla, Gilberto (2019) Nonlinear gas sensing based on third-harmonic generation in cascaded chalcogenide microfibers. Journal of the Optical Society of America B, 36 (2), 300-305. (doi:10.1364/JOSAB.36.000300).

Record type: Article

Abstract

The performance of conventional gas sensors based on light absorption in the mid-infrared (MIR) faces the challenges of the high cost and low efficiency of photodetection at these wavelengths. In this paper, a nonlinear gas sensor based on third-harmonic generation (THG) in cascaded chalcogenide microfibers is proposed. In the first microfiber section, the input MIR light with “fingerprint” frequency has shown the ability for a large amount of gas absorption. The second microfiber section is used for THG pumped by the residual MIR light. In this process, the sensing signal is converted to the near-infrared region, and the power variation caused by the absorption is amplified due to the nonlinear relation between pump and harmonic signals. According to our analysis, the lowest methane concentration of 7.4 × 10−8 can be detected at a practically drawable Ae2Se3 microfiber length of 1 cm. Compared to direct MIR gas sensing, cascaded microfiber sensing has the advantages of improved sensing performance and also shorter absorption length.

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More information

Accepted/In Press date: 12 December 2018
e-pub ahead of print date: 13 December 2018
Published date: 1 February 2019

Identifiers

Local EPrints ID: 428959
URI: https://eprints.soton.ac.uk/id/eprint/428959
ISSN: 0740-3224
PURE UUID: 22defb27-687f-4288-9da8-fd8333752f0d

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Date deposited: 15 Mar 2019 17:30
Last modified: 15 Mar 2019 17:30

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Contributors

Author: Pan Huang
Author: Tianye Huang
Author: Shuwen Zeng
Author: Jianxing Pan
Author: Xu Wu
Author: Xiang Zhao
Author: Yiheng Wu
Author: Perry Shum Ping

University divisions

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