TITLE:
Nanostructured Metal Aggregate-Assisted Lasing in Rhodamine 6G Solutions
AUTHORS:
Valery A. Donchenko, Yuri E. Geints, Vladimir A. Kharenkov, Alexey A. Zemlyanov
KEYWORDS:
Nano-Composite; Luminescence; Lasing; Metal Agglomerate; Surface Plasmon-Polariton Resonance
JOURNAL NAME:
Optics and Photonics Journal,
Vol.3 No.8A,
December
19,
2013
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.