A colorimetric sensor providing a direct visual indication of chemical contamination was developed. The sensor is a combination of a chemically sensitive dye layer and a resonant waveguide grating. Enhancement of the light absorption by the photonic structure can be clearly seen. The detection is based on the color change of the reflected light after exposure to a gas or a liquid. Low-cost 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.
© 2013 Optical Society of America
Original Manuscript: August 8, 2012
Revised Manuscript: November 5, 2012
Manuscript Accepted: December 3, 2012
Published: January 11, 2013
Laurent Davoine, Vincent Paeder, Guillaume Basset, Marc Schnieper, and Hans Peter Herzig, "Resonant absorption of a chemically sensitive layer based on waveguide gratings," Appl. Opt. 52, 340-349 (2013)