6 May 2011 Visual gas sensors based on dye thin films and resonant waveguide gratings
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Abstract
A colorimetric sensor that provides a direct visual indication of chemical contamination was developed. The detection is based on the color change of the reflected light after exposure to a gas or a liquid. The sensor is a combination of a chemically sensitive dye layer and a subwavelength grating structure. To enhance the perception of color change, a reference area sealed under a non-contaminated atmosphere is used and placed next to the sensor. The color change is clearly visible by human eyes. The device is based on photonic resonant effects; the visible color is a direct reflection of some incoming light, therefore no additional supplies are needed. This makes it usable as a standalone disposable sensor. The dye thin film is deposited by Plasma enhanced chemical vapor deposition (PECVD) on top of the subwavelength structure. The latter is made by combining a replication process of a Sol-Gel material and a thin film deposition. Lowcost fabrication and compatibility with environments where electricity cannot be used make this device very attractive for applications in hospitals, industries, with explosives and in traffic.
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L. Davoine, L. Davoine, M. Schnieper, M. Schnieper, A. Barranco, A. Barranco, F. J. Aparicio, F. J. Aparicio, } "Visual gas sensors based on dye thin films and resonant waveguide gratings", Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 807312 (6 May 2011); doi: 10.1117/12.889358; https://doi.org/10.1117/12.889358
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