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Artigo Produção Nacional Revisado por pares
BIBTEX RIS

Dependence of random laser emission on silver nanoparticle density in PMMA films containing rhodamine 6G

2011; Optica Publishing Group; Volume: 28; Issue: 5 Linguagem: Inglês

10.1364/josab.28.001118

ISSN

1520-8540

Autores

Christian Tolentino Dominguez, R.L. Maltez, Roberto dos Reis, Luciana Santos Afonso de Melo, Cid B. de Araújo, Anderson S. L. Gomes,

Tópico(s)

Neural dynamics and brain function

Resumo

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 TiO2 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.

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