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This chapter presents numerical studies of Kretschmann- and Otto-type surface plasmon resonance (SPR) waveguide sensors at terahertz frequencies. The reflectance of a three-layer model for the Kretschmann sensor is studied using the Fresnel equation to determine the angle of incidence of the waveguide. The frequency-dependent finite-difference time-domain method is used to study the SPR response of the waveguide sensor to temperature variations. It is found that a high sensitivity of 2.63 \(\times \) 10 \(^{-2}\) THz/K, more than three times that of the conventional SPR waveguide sensor, is successfully achieved with a sensing length about half that of the conventional one. The Otto-type waveguide sensor is also investigated and discussed. It is shown that the sensor provides steep and stable SPR responses while maintaining the sensitivity of the Kretschmann type.

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Kretschmann- and Otto-Type SPR Waveguide Sensors at Terahertz Frequencies

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  • 发表日期：

    2025年

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  • Jun Shibayama

摘要

This chapter presents numerical studies of Kretschmann- and Otto-type surface plasmon resonance (SPR) waveguide sensors at terahertz frequencies. The reflectance of a three-layer model for the Kretschmann sensor is studied using the Fresnel equation to determine the angle of incidence of the waveguide. The frequency-dependent finite-difference time-domain method is used to study the SPR response of the waveguide sensor to temperature variations. It is found that a high sensitivity of 2.63 \(\times \) 10 \(^{-2}\) THz/K, more than three times that of the conventional SPR waveguide sensor, is successfully achieved with a sensing length about half that of the conventional one. The Otto-type waveguide sensor is also investigated and discussed. It is shown that the sensor provides steep and stable SPR responses while maintaining the sensitivity of the Kretschmann type.