Chemisorption-induced reflectivity changes in optically thin silver films

Butler, M. A.; Ricco, A. J.
October 1988
Applied Physics Letters;10/17/1988, Vol. 53 Issue 16, p1471
Academic Journal
The reflectivity of an optically thin metal film has been used to investigate its interactions with chemisorbed molecules. Reflectivity decreases for semitransparent, thin (50–250 Å) silver films vacuum evaporated on the end of multimode optical fibers were observed at 860 nm during chemisorption of various molecules. The magnitude of the decrease depends on the nature of the molecule/silver interaction. The dependence of this effect on film thickness is consistent with changes in the optical thickness as a result of chemisorption. This effect may lead to the development of new chemical sensors.


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