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Updated: Jun 23, 2025

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Micro-Ring Resonator Assisted Photothermal Spectroscopy of Water Vapor
Maria V Kotlyar1,2, Jenitta Johnson Mapranathukaran1,2, Gabriele Biagi1,2,3
1Centre for Advanced Photonics and Process Analysis, Munster Technological University, Bishopstown, T12 P928 Cork, Ireland.
Abstract:
We demonstrated, for the first time, micro-ring resonator assisted photothermal spectroscopy measurement of a gas phase sample. The experiment used a telecoms wavelength probe laser that was coupled to a silicon nitride photonic integrated circuit using a fibre array. We excited the photothermal effect in the water vapor above the micro-ring using a 1395 nm diode laser. We measured the 1f and 2f wavelength modulation response versus excitation laser wavelength and verified the power scaling behaviour of the signal.
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