Gas sensing using THz phase-shifted waveguide Bragg gratings based on 3D-printed two-wire plasmonic waveguides

Yang Cao; Kathirvel Nallappan; Guofu Xu; Maksim Skorobogatiy

doi:10.1117/12.2662592

15 June 2023 Gas sensing using THz phase-shifted waveguide Bragg gratings based on 3D-printed two-wire plasmonic waveguides

Yang Cao, Kathirvel Nallappan, Guofu Xu, Maksim Skorobogatiy

Author Affiliations +

Proceedings Volume 12532, Optical Waveguide and Laser Sensors II; 125320S (2023) https://doi.org/10.1117/12.2662592
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

THz phase-shifted waveguide Bragg gratings built on modular 3D-printed two-wire plasmonic waveguides are used experimentally for gas sensing. The physical parameters of a gas flowing along the grating are then monitored in real time by detecting the spectral position of a narrow transmission peak. The sensor sensitivity was found to be 133 GHz/RIU near 0.14 THz, with a theoretical sensor resolution of 7.5.10-5 RIU. The detection of glycerol vapors in air generated by an electronic cigarette was shown experimentally. The developed THz gas sensor can find its practical applications in environmental pollution monitoring and leak detection.

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Citation Download Citation

Yang Cao, Kathirvel Nallappan, Guofu Xu, and Maksim Skorobogatiy "Gas sensing using THz phase-shifted waveguide Bragg gratings based on 3D-printed two-wire plasmonic waveguides", Proc. SPIE 12532, Optical Waveguide and Laser Sensors II, 125320S (15 June 2023); https://doi.org/10.1117/12.2662592

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