Abstract

This Letter demonstrates a novel, to the best of our knowledge, hydrogen sensor based on a polymer planar Bragg grating coated with Pt-loaded ${{\rm WO}_3} {\text -} {{\rm SiO}_2}$. The reflected Bragg signal shows a distinct peak splitting correlated to substrate anisotropies originating from the injection molding process. Especially at low ${{\rm H}_2}$ concentrations, both sensing peaks exhibit an outstanding response to the heat generated by the exothermic reaction between hydrogen molecules and coating. Thereby, a hydrogen volume ratio of 50 ppm leads to a Bragg wavelength shift of ${-}{37}\;{\rm pm}$, which yields an outstandingly low detection limit of only 5 ppm ${{\rm H}_2}$ in air. Thus, functionalized polymer planar Bragg gratings are eminently suitable for ${{\rm H}_2}$ leak detection applications.

© 2020 Optical Society of America

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Corrections

Stefan Kefer, Jixiang Dai, Minghong Yang, Bernhard Schmauss, and Ralf Hellmann, "Hypersensitive H2 sensor based on polymer planar Bragg gratings coated with Pt-loaded WO3–SiO2: erratum," Opt. Lett. 45, 4498-4498 (2020)
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-45-16-4498

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