We report experiments on random lasers based on films of poly(methyl methacrylate) containing rhodamine 6G and silver nanoparticles (NPs). The films were deposited on an aluminum-coated substrate that provides reinjection of leaking photons. The results show strong dependence of the emission on the silver NPs' density and smaller linewidth and threshold due to the feedback provided by the aluminum film. For comparison purposes, samples with TiO 2 NPs were also prepared, and no evidence of random lasers was obtained for the same experimental conditions. This demonstrates that higher optical gain for lasing is obtained using silver NPs mainly due to the contribution of localized surface plasmons in the NPs.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of the Optical Society of America B: Optical Physics|
|State||Published - Jan 1 2011|
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Atomic and Molecular Physics, and Optics