21 April 2016 Evanescent wave sensors for mid-IR spectroscopy
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An important problem of investigation of the air and water contamination by the mid-IR spectroscopy is discussed. A model of evanescent wave sensor made of a multimode waveguide transparent in the mid-IR spectral range is developed. Transmittance and sensitivity of a sensing element consisting of an input chalcogenide waveguide and a sensing waveguide depend on distribution of the guided modes amplitudes in the sensing waveguide. We have demonstrated that excitation of higher-order modes is important for optimal performance of such a sensor.
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S. V. Korsakova, S. V. Korsakova, E. A. Romanova, E. A. Romanova, } "Evanescent wave sensors for mid-IR spectroscopy", Proc. SPIE 9917, Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS), 99173G (21 April 2016); doi: 10.1117/12.2230148; https://doi.org/10.1117/12.2230148

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