Plasmonically enhanced diffusive and subdiffusive metal nanoparticle-dye random laser

Dice, G. D.; Mujumdar, S.; Elezzabi, A. Y.
March 2005
Applied Physics Letters;3/28/2005, Vol. 86 Issue 13, p131105
Academic Journal
We report on surface plasmon (SP)-enhanced random laser emission from a suspension of silver nanoparticles in a laser dye operating at diffusive and subdiffusive scattering strengths. SP resonance enhances the scattering cross section, while the geometrical cross section remains small, thus providing a large gain volume. The localized electromagnetic field near the particle surface leads to enhanced absorption of excitation light and larger amplification of fluorescence. The metal-nanoparticle-based random laser yields larger linewidth narrowing at lower pump fluence threshold than a dielectric-scatterer-based random laser under equivalent conditions. These findings open the door to studies of applications related to light amplification assisted by SP in metallic nanoparticles.


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