Nanostructured Metal Aggregate-Assisted Lasing in Rhodamine 6G Solutions

Abstract

We report on the experimental demonstration of considerable lowering of stimulated luminescence (lasing) threshold in R6G laser dye solution doped with metal agglomerates (Ag, Al, Ni) upon second harmonic of Nd:YAG-laser illumination. Due to strong structural coupling between individual nanoparticles, they may form fractal agglomerates providing an extreme optical pump-field enhancement near their complicated surface. For the first time, we have observed more than twofold increase in lasing efficiency of metal aggregated dye solution as compared to non-agglomerated monomeric metal nanocolloids. No random laser manifestation or surface plasmon-polariton resonances excitations were observed.

Photo-Physical Characteristics of Janus Green B in Different Solvents and its Interaction Mechanism with Silver Nanoparticles

“…The second contributing factor to the observed increase in fluorescence intensity is the augmented number of excited active molecules due to enhanced local optical pump fields near the NP surface. This effect is expected to manifest in active media containing NPs with discernible plasmon resonance characteristics in the employed spectrum range [66,67]. Silver nanoparticles, exhibiting strong plasmon resonances in the visible spectrum, are noteworthy in this context.…”