Side-polished fiber evanescent wave quartz-enhanced photoacoustic spectroscopy employing dielectric coatings for evanescent field enhancement.

Cian F Twomey, Gabriele Biagi, Albert A Ruth, Farhan Ali, Andrea Di Falco, Liam O'Faolain, Anton J Walsh

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Article in Photoacoustics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Cian F TwomeyCentre for Advanced Photonics and Process Analysis, Munster Technological University, Cork, T12 P928, Ireland.

Gabriele BiagiCentre for Advanced Photonics and Process Analysis, Munster Technological University, Cork, T12 P928, Ireland.

Albert A RuthSchool of Physics and Sustainability Institute, University College Cork, Cork, Ireland.

Farhan AliSchool of Physics and Astronomy, University of St Andrews, St Andrews, Fife, KY16 9SS, Scotland, United Kingdom.

Andrea Di FalcoSchool of Physics and Astronomy, University of St Andrews, St Andrews, Fife, KY16 9SS, Scotland, United Kingdom.

Liam O'FaolainCentre for Advanced Photonics and Process Analysis, Munster Technological University, Cork, T12 P928, Ireland.

Anton J WalshCentre for Advanced Photonics and Process Analysis, Munster Technological University, Cork, T12 P928, Ireland.

Funding

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6 · The paper itself

Abstract

We report an all-fiber laser gas analyzer (LGA) based on quartz-enhanced photoacoustic spectroscopy (QEPAS) that exploits strong evanescent wave (EW) enhancement using a dielectric coating on side-polished fiber. The dielectric coating increases the fraction of the evanescent field in air, significantly amplifying light-gas interaction within the polished region. A single-mode fiber with a 17 mm polished section passes through two millimeter-scale resonator tubes and a custom quartz tuning fork (QTF) with 0.8 mm prong spacing. The optimized EW coupling efficiently generates photoacoustic waves that excite the QTF's fundamental flexural mode. Methane-nitrogen mixtures at 800 mbar were used to evaluate performance, achieving a detection limit of 2.5 ppmv for CH

Indexed as

Coated side-polished fiberEnvironmental monitoringEvanescent wave QEPASMultiple gas detectionOptical fiber sensorQuartz-enhanced photoacoustic spectroscopy (QEPAS)Trace gas sensing

Identifiers

PMID41321401

DOI10.1016/j.pacs.2025.100782

PMCPMC12664072

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