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Proceedings Paper

Visual gas sensors based on dye thin films and resonant waveguide gratings
Author(s): L. Davoine; M. Schnieper; A. Barranco; F. J. Aparicio
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Paper 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.

Paper Details

Date Published: 6 May 2011
PDF: 7 pages
Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 807312 (6 May 2011); doi: 10.1117/12.889358
Show Author Affiliations
L. Davoine, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)
M. Schnieper, Ctr. Suisse d'Electronique et de Microtechnique SA (Switzerland)
A. Barranco, Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (Spain)
F. J. Aparicio, Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (Spain)


Published in SPIE Proceedings Vol. 8073:
Optical Sensors 2011; and Photonic Crystal Fibers V
Kyriacos Kalli; Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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