Abstract
This chapter discusses the demonstrated enhancement of localized surface plasmons (SPs) oscillation in the aggregate of silver (Ag) nanoparticles by optical gain in the surrounding dye. It also discusses the demonstrated enhancement of spontaneous and stimulated emission of rhodamine 6G (R6G) laser dye by Ag aggregate. The absorption spectrum of Ag aggregate has one structureless band covering the whole visible range and extending to near-infrared. The chapter demonstrates that by adding the solution of aggregated silver nanoparticles to the solution of rhodamine 6G laser dye, one can enhance the efficiency of the spontaneous and the stimulated emission. It attributes the increase of the spontaneous emission intensity of dye to the increase of the absorption efficiency caused by the field enhancements in metallic nanostructures associated with SPs. The chapter observes the compensation of loss in metal by gain in interfacing dielectric in the mixture of aggregated silver nanoparticles and rhodamine 6G laser dye. The demonstrated sixfold enhancement of the Rayleigh scattering is the evidence of the quality factor increase of the SP resonance. This paves the road for numerous applications of nanoplasmonics, which currently suffer from strong damping caused by absorption loss in metal.
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