title: Resonant absorption of a chemically sensitive layer based on waveguide gratings.
abstract: 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.
authors: Thin Film Optics Department, Centre Suisse d’Electronique et de Microtechnique (CSEM), Muttenz, Switzerland. davoine.laurent@gmail.com
authors: Laurent
authors: L
authors: Davoine
authors: Vincent
authors: V
authors: Paeder
authors: Guillaume
authors: G
authors: Basset
authors: Marc
authors: M
authors: Schnieper
authors: Hans Peter
authors: HP
authors: Herzig
mesh_terms: D000042:Absorption; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003124:Colorimetry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis*; D008027:Light; D008832:Microchemistry / Q000295:instrumentation*; D012996:Solutions / Q000032:analysis*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D005740:Gases; D012996:Solutions