Kotlyar, M., Johnson Mapranathukaran, J., Biagi, G., Walsh, A., Lendl, B., & O’Faolain, L. (2024). Micro-Ring Resonator Assisted Photothermal Spectroscopy of Water Vapor. Sensors, 24(11), Article 3679. https://doi.org/10.3390/s24113679
integrated photonics; photothermal spectroscopy; refractive index sensing
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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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Project title:
Photonic Accurate and Portable Sensor Systems Exploiting Photo-Acoustic and Photo-Thermal Based Spectroscopy for Real-Time Outdoor Air Pollution Monitoring: 101016956 (European Commission)
CC BY 4.0
