Random Lasing at Localization Transition in a Colloidal Suspension (TiO2@Silica)
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Anderson localization of light and random
lasing in this critical regime is an open research frontier,
which besides being a basic research topic could also lead to
important applications. This article investigates the random
laser action at the localization transition in a strongly
disordered scattering medium composed of a colloidal
suspension of core−shell nanoparticles (TiO2@Silica) in
ethanol solution of Rhodamine 6G. The classical superfluorescence
band of the random laser was measured
separately by collecting the emission at the back of the
samples, showing a linear dependence with pumping fluence
without gain depletion. However, frontal collection showed
saturation of the absorption and emission. Narrow peaks of
approximately equal intensity are observed on top of the classical superfluorescence band, indicating suppression of the
interaction between the peaks modes. The linewidth of these peaks is lower than that of the passive modes of the scattering
medium. A method called fraction of absorbed pumping allowed us to infer that this peak’s mode (localized modes) is confined
to a shallow region near the input-pumping border.
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JIMENEZ-VILLAR, ERNESTO; SILVA, IRAN F. da; MESTRE, VALDECI; WETTER, NIKLAUS U.; LOPEZ, CEFE; OLIVEIRA, PAULO C. de; FAUSTINO, WAGNER M.; SA, GILBERTO F. de. Random Lasing at Localization Transition in a Colloidal Suspension (TiO2@Silica). ACS Omega, v. 2, n. 6, p. 2415-2421, 2017. DOI: 10.1021/acsomega.7b00086. Disponível em: http://repositorio.ipen.br/handle/123456789/27747. Acesso em: 30 Dec 2025.
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