Model of the planar broadband differential waveguide interferometer as a humidity sensor


  • Kazimierz Gut Department of Optoelectronics, Silesian University of Technology



The paper presents a model of the planar broadband differential waveguide interferometer. Its response to the change in thickness and refractive index of the waveguide layer due to the change in humidity is presented. The analysis was carried out for the wavelength range from 450 nm to 850 nm. The orthogonal modes TE0 and TM0, which propagate in this wavelength range, are considered. It is shown that by using light near the maximum of the system characteristic, instead of the spectrometer, the total power at the system output can be measured.

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How to Cite

K. Gut, “Model of the planar broadband differential waveguide interferometer as a humidity sensor”, Photonics Lett. Pol., vol. 12, no. 2, pp. 55–57, Jul. 2020.