Effect of plasmonic nanoparticles on generation properties dye molecules

The effect of plasmonic nanoparticles (NP) on the generation of radiation by organic dye molecules has been theoretically and experimentally investigated. To calculate the intensity of radiation generated by molecules in the presence of plasmonic NPS, a theoretical model is proposed that takes into account the change in the rates of spontaneous and stimulated radiation of a molecule, nonradiative relaxation of the molecule, and light absorption by a molecule near the NPS in the velocity equations of a three-level laser. The nonmonotonic dependence of the threshold of generation of an aqueous solution of rhodamine 6G on the concentration of NPS in the solution observed in the experiment is explained on the basis of the proposed model.