Articles | Volume 11, issue 1
J. Sens. Sens. Syst., 11, 15–20, 2022
https://doi.org/10.5194/jsss-11-15-2022

Special issue: Sensors and Measurement Science International SMSI 2021

J. Sens. Sens. Syst., 11, 15–20, 2022
https://doi.org/10.5194/jsss-11-15-2022

Regular research article 14 Jan 2022

Regular research article | 14 Jan 2022

Numerical analysis of an infrared gas sensor utilizing an indium-tin-oxide-based plasmonic slot waveguide

Parviz Saeidi et al.

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Cited articles

Aydın, E. B. and Sezgintürk, M. K.: Indium tin oxide (ITO): a promising material in biosensing technology, TrAC-Trend Anal. Chem., 97, 309–315, https://doi.org/10.1016/j.trac.2017.09.021, 2017. 
Barnes, W. L., Dereux, A., and Ebbesen, T. W.: Surface plasmon subwavelength optics, Nature, 424, 824–830, https://doi.org/10.1038/nature01937, 2003. 
Chen, K., Guo, P., Dao, T. D., Li, S. Q., Ishii, S., Nagao, T., and Chang, R. P.: Protein-Functionalized Indium-Tin Oxide Nanoantenna Arrays for Selective Infrared Biosensing, Adv. Opt. Mat., 5, 1700091, https://doi.org/10.1002/adom.201700091, 2017. 
COMSOL: Multiphysics® v. 5.6., available at: https://www.comsol.com/ (last access: 11 January 2022), COMSOL AB, Stockholm, Sweden, 2022. 
Dao, T. D., Doan, A. T., Ngo, D. H., Chen, K., Ishii, S., Tamanai, A., and Nagao, T.: Selective thermal emitters with infrared plasmonic indium tin oxide working in the atmosphere, Opt. Mater. Express, 9, 2534–2544, https://doi.org/10.1364/OME.9.002534, 2019. 
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Short summary
We investigated the feasibility of indium tin oxide (ITO) as an alternative plasmonic material to replace noble metals for sensing applications in the mid-infrared region. An ITO-based plasmonic slot waveguide was numerically designed and analysed for a wavelength of 4.26 µm, which is the absorption band of CO2. As the proposed structure shows low propagation lengths, we concluded that ITO appears not to be an appropriate candidate for plasmonic waveguiding systems.