|A. Vasiliev, A. Malik, M. Muneeb, R. Baets, G. Roelkens
|Design of Cavity-Enhanced Photothermal Mid-Infrared Spectroscopy for Sensing Applications
|International Conference Proceedings
|Proceedings of the 20th Annual Symposium of the IEEE Photonics Benelux Chapter
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A design is presented which combines the mature Silicon-On-Insulator (SOI) platform at telecom wavelengths with the ultra-sensitive and selective photothermal spectroscopy for miniaturized sensing applications. Organic based materials all exhibit a distinct “fingerprint” region in the mid-infrared (3-4 μm) part of the absorption spectrum α(λ) which can be probed using a tunable mid-infrared source. Absorption gives rise to a temperature change which changes the real part of the refractive index through the thermo-optic effect. Simulations show that localization of thermal and optical interactions allows for a very sensitive and compact measurement method.
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