Abstract
Langmuir-Blodgett (LB) films of N,N′-dioctadecyl rhodamine B (RhB derivative) were deposited on silver island films. The absorption spectra of the composite films were measured. Enhancement of the absorption was detected. The degree of enhancement decreased as the distance between the silver island film surface and the dye monolayers increased. When the distance between the silver island film surface and the dye monolayers became longer than ca. 20 nm, the interaction of the silver particles in the island film with the adsorbed RhB derivative almost vanished. The enhancement does not arise from the formation of a new chemical substance or complex. The electromagnetic model may provide a possible mechanism of the enhanced absorption. The absorption spectra of LB films of arachic acid on the silver island films were also measured. Enhancement of the visible absorption of the silver island film by the transparent arachic acid overlayer was discovered.
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