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Sensitivity of Reflecting Terahertz Sensors of Aqueous Solutions

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Abstract

Sensitivity of sensors of aqueous solutions in which a terahertz signal is reflected from a structure consisting of a dielectric film and solution is studied. The maximum sensitivity is reached at angles of incidence and radiation frequencies that provide zero reflection of monochromatic radiation from the specified structure. Conditions for such reflection are determined for the s- and p-polarized radiation. The calculated results are proven by experimental data for a sensor of glucose in water in which a thin silicon film separates the solution from air. For the time-domain terahertz spectroscopy, the proposed sensor structure allows reliable detection and identification of glucose at concentrations of 10 and 30 g/L.

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ACKNOWLEDGMENTS

We are grateful to the colleagues from Moscow State University for assistance in the experiments.

Funding

This work was supported by the State Program of Scientific Research “Photonics and opto- and microelectronics” (project 1.3.03 “Development of the Theory of the Methods for Optical Monitoring of Nanosized Thin-Film Structures”) and the Russian Foundation for Basic Research (project no. 17-00-00270).

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Authors and Affiliations

  1. Kuleshov State University, 212022, Mogilev, Belarus

    A. B. Sotsky & S. S. Miheev

  2. National Research Center Kurchatov Institute, 123098, Moscow, Russia

    M. M. Nazarov

  3. Belarusian–Russian University, 212000, Mogilev, Belarus

    L. I. Sotskaya

Authors
  1. A. B. Sotsky
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  2. M. M. Nazarov
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  3. S. S. Miheev
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  4. L. I. Sotskaya
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Corresponding author

Correspondence to A. B. Sotsky.

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The authors declare that there is no conflicts of interest.

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Translated by A. Chikishev

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Sotsky, A.B., Nazarov, M.M., Miheev, S.S. et al. Sensitivity of Reflecting Terahertz Sensors of Aqueous Solutions. Tech. Phys. 66, 305–315 (2021). https://doi.org/10.1134/S1063784221020195

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  • DOI: https://doi.org/10.1134/S1063784221020195

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