One-dimensional photonic crystal used for relative humidity sensing based on the phase shift of the Bloch surface waves

Roman Kanok; Petr Hlubina; Lucie Gembalová; Dalibor Ciprian

doi:10.1117/12.2621434

17 May 2022 One-dimensional photonic crystal used for relative humidity sensing based on the phase shift of the Bloch surface waves

Roman Kanok, Petr Hlubina, Lucie Gembalová, Dalibor Ciprian

Author Affiliations +

Proceedings Volume 12139, Optical Sensing and Detection VII; 121391G (2022) https://doi.org/10.1117/12.2621434
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

One of many possible applications of a one-dimensional photonic crystal (1DPhC) is sensing utilizing the Bloch surface wave (BSW). In this paper, we present a method of relative humidity (RH) sensing based on the phase shift of the BSW supported by a truncated 1DPhC represented by a multilayered structure. The structure is composed of six TiO₂/SiO₂ bilayers with a termination layer of TiO₂. The BSW is excited by a total internal reflection of light in the Kretschmann configuration. A spectral interferometric technique is used to obtain a channeled spectrum due to projections of both reflected s and p polarized light waves. The phase is retrieved using a Windowed Fourier transform and spectral derivatives forming peaks are calculated. The sensing concept is based on tracking the derivative peak as a function of RH. A sensitivity to humidity of 0.028 nm/%RH and figure of merit of 0.0042 %RH₋₁ were determined.

Citation Download Citation

Roman Kanok, Petr Hlubina, Lucie Gembalová, and Dalibor Ciprian "One-dimensional photonic crystal used for relative humidity sensing based on the phase shift of the Bloch surface waves", Proc. SPIE 12139, Optical Sensing and Detection VII, 121391G (17 May 2022); https://doi.org/10.1117/12.2621434

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