Yang Cao, Kathirvel Nallappan, Guofu Xu et Maksim A. Skorobogatiy
Article de revue (2023)
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Libre accès au plein texte de ce document Version officielle de l'éditeur Conditions d'utilisation: Creative Commons: Attribution (CC BY) Télécharger (3MB) |
Abstract
The development of low-cost sensing devices with high compactness, flexibility, and robustness is of significance for practical applications of optical gas sensing. In this work, we propose a waveguide-based resonant gas sensor operating in the terahertz frequency band. It features micro-encapsulated two-wire plasmonic waveguides and a phase-shifted waveguide Bragg grating (WBG). The modular semi-sealed structure ensures the controllable and efficient interaction between terahertz radiation and gaseous analytes of small quantities. WBG built by superimposing periodical features on one wire shows high reflection and a low transmission coefficient within the grating stopband. Phase-shifted grating is developed by inserting a Fabry–Perot cavity in the form of a straight waveguide section inside the uniform gratings. Its spectral response is optimized for sensing by tailoring the cavity length and the number of grating periods. Gas sensor operating around 140 GHz, featuring a sensitivity of 144 GHz/RIU to the variation in the gas refractive index, with resolution of 7 X 10 -5 RIU, is developed. In proof-of-concept experiments, gas sensing was demonstrated by monitoring the real-time spectral response of the phase-shifted grating to glycerol vapor flowing through its sealed cavity. We believe that the phase-shifted grating-based terahertz resonant gas sensor can open new opportunities in the monitoring of gaseous analytes.
Mots clés
terahertz technology; gas sensing; plasmonic waveguide; phase-shifted grating; additive manufacturing
Département: | Département de génie physique |
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Organismes subventionnaires: | National Natural Science Foundation of China |
Numéro de subvention: | 62205100 |
URL de PolyPublie: | https://publications.polymtl.ca/56750/ |
Titre de la revue: | Sensors (vol. 23, no 20) |
Maison d'édition: | Multidisciplinary Digital Publishing Institute |
DOI: | 10.3390/s23208527 |
URL officielle: | https://doi.org/10.3390/s23208527 |
Date du dépôt: | 23 janv. 2024 12:29 |
Dernière modification: | 30 sept. 2024 11:27 |
Citer en APA 7: | Cao, Y., Nallappan, K., Xu, G., & Skorobogatiy, M. A. (2023). Resonant gas sensing in the terahertz spectral range using two-wire phase-shifted waveguide Bragg gratings. Sensors, 23(20), 8527 (10 pages). https://doi.org/10.3390/s23208527 |
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