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Mode-phase-difference photothermal spectroscopy for gas detection with an anti-resonant hollow-core optical fiber.

ABSTRACT: Laser spectroscopy outperforms electrochemical and semiconductor gas sensors in selectivity and environmental survivability. However, the performance of the state-of-the-art laser sensors is still insufficient for many high precision applications. Here, we report mode-phase-difference photothermal spectroscopy with a dual-mode anti-resonant hollow-core optical fiber and demonstrate all-fiber gas (acetylene) detection down to ppt (parts-per-trillion) and <1% instability over a period of 3 hours. An anti-resonant hollow-core fiber could be designed to transmit light signals over a broad wavelength range from visible to infrared, covering molecular absorption lines of many important gases. This would enable multi-component gas detection with a single sensing element and pave the way for ultra-precision gas sensing for medical, environmental and industrial applications.

SUBMITTER: Zhao P

PROVIDER: S-EPMC7015925 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Mode-phase-difference photothermal spectroscopy for gas detection with an anti-resonant hollow-core optical fiber.

Zhao Pengcheng P Zhao Yan Y Bao Haihong H Ho Hoi Lut HL Jin Wei W Fan Shangchun S Gao Shoufei S Wang Yingying Y Wang Pu P

Nature communications 20200212 1

Laser spectroscopy outperforms electrochemical and semiconductor gas sensors in selectivity and environmental survivability. However, the performance of the state-of-the-art laser sensors is still insufficient for many high precision applications. Here, we report mode-phase-difference photothermal spectroscopy with a dual-mode anti-resonant hollow-core optical fiber and demonstrate all-fiber gas (acetylene) detection down to ppt (parts-per-trillion) and <1% instability over a period of 3 hours. ...[more]

PMID: 32051415

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