Evanescent-wave optical gas sensor with a porous thin-film coating
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In this paper, we present the analysis and numerical model of absorptive gas detection by an optical evanescent-wave sensor. We investigate the influence of sensor geometry and thin-film porosity on the attenuation of guided modes caused by their interaction with the gas. We show that film porosity is a critical parameter that should be carefully optimized for a chosen mode. These findings served as a basis for the design of an experimentally realizable sensor of carbon dioxide.
Keywords:evanescent-wave sensors / porous film / gas sensing
Source:Physica Scripta, 2014, T162
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