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Micro-Ring Resonator Assisted Photothermal Spectroscopy of Water Vapor.

Maria V KotlyarJenitta Johnson MapranathukaranGabriele BiagiAnton WalshBernhard LendlLiam O'Faolain
Published in: Sensors (Basel, Switzerland) (2024)
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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