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

Christian Tolentino Dominguez, Rogério L. Maltez, Roberto dos Reis, Luciana S.A. De Melo, Cid B. De Araújo, Anderson S.L. Gomes

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

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 languageEnglish (US)
Pages (from-to)1118-1123
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Volume28
Issue number5
DOIs
StatePublished - Jan 1 2011

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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