Özçelik, S.Özçelik, I.Akins, D. L.2015-07-282015-07-2819980003-6951http://hdl.handle.net/11693/10937The picosecond time-resolved emission spectrum of the cyanine dye 1,18-diethyl-3,38- bis-~3-sulfopropyl!-5,58,6,68-tetrachlorobenzimidazolocarbocyanine ~also known as BIC! adsorbed onto colloidal silver was examined as a function of laser pulse energy at room temperature. BIC is found to aggregate on colloidal silver, and the number of coherently responding molecules involved in the one-exciton state ~i.e., the coherence length! was estimated to involve 8–9 molecules. Lasing at a remarkably low incident pulse energy threshold was found for this system and explained in terms of a mechanism involving superradiant states created in coherently coupled adsorbed molecules that emit photons which stimulate emission from other spatially distributed superradiant states. © 1998 American Institute of Physics.EnglishGeographic distri adsorptionColloidsExcitonsLight absorptionLight emissionMolecular orientationMoleculesPhotonsSilverColloidal silverCyaninePicosecond time resolved emissionArticle10.1063/1.122563