Core-shell (TiO2@Silica) nanoparticles for random lasers

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dc.contributor.authorJIMENEZ-VILLAR, E.
dc.contributor.authorMESTRE, VALDECI
dc.contributor.authorWETTER, N.U.
dc.contributor.authorSA, GILBERTO F. de
dc.contributor.editorGALVEZ, ENRIQUE J.
dc.contributor.editorANDREWS, DAVID L.
dc.contributor.editorGLUCKSTAD, JESPER
dc.coverageInternacionalpt_BR
dc.creator.eventoCOMPLEX LIGHT AND OPTICAL FORCES, 12thpt_BR
dc.date.accessioned2018-09-13T18:35:50Z
dc.date.available2018-09-13T18:35:50Z
dc.date.eventoJanuary 27 - February 01, 2018pt_BR
dc.description.abstractScattering media are of great current interest, due to their potential applications in photovoltaic cells, efficient photocatalyzers, random lasers and novel optical functional devices. Here, we have introduced a core–shell scattering medium for random lasing composed by core-shell nanoparticles (TiO2@Silica) suspended in an ethanol solution of Rhodamine 6G. Higher efficiency, lower laser threshold and long photobleaching lifetime were demonstrated in random laser. A promising method called fraction of absorbed pumping (FAP) has been introduced, which opens a new avenue to characterize and study scattering media. In this article, we also investigate the random laser action at the critical regime of localization by increasing considerably the concentration of TiO2@Silica nanoparticles. Narrow peaks arising in the random laser emission spectrum are observed. 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 the saturation of emission and absorption. The emission spectrum of the peak mode (localized modes) shows approximately equal intensity, 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, which was attributed to an anomalous nonlinear increase of the refractive index by localization.pt_BR
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)pt_BR
dc.description.sponsorshipIDFAPESP: 17/05854-9; 17/10765-5pt_BR
dc.event.siglaSPIEpt_BR
dc.format.extent105490D-1 - 105490D-1pt_BR
dc.identifier.citationJIMENEZ-VILLAR, E.; MESTRE, VALDECI; WETTER, N.U.; SA, GILBERTO F. de. Core-shell (TiO2@Silica) nanoparticles for random lasers. In: GALVEZ, ENRIQUE J. (ed.); ANDREWS, DAVID L. (ed.); GLUCKSTAD, JESPER (ed.). In: COMPLEX LIGHT AND OPTICAL FORCES, 12th, January 27 - February 01, 2018, San Francisco, California, USA. <b>Proceedings...</b> Bellingham, WA, USA: Society of Photo-optical Instrumentation Engineers, 2018. p. 105490D-1 - 105490D-1. (SPIE Proceedings Series, 10549). DOI: <a href="https://dx.doi.org/10.1117/12.2289228">10.1117/12.2289228</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/29136.
dc.identifier.doi10.1117/12.2289228pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-9379-9530
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/29136
dc.localBellingham, WA, USApt_BR
dc.local.eventoSan Francisco, California, USApt_BR
dc.publisherSociety of Photo-optical Instrumentation Engineerspt_BR
dc.relation.ispartofseriesSPIE Proceedings Series, 10549pt_BR
dc.rightsopenAccesspt_BR
dc.subjectnanoparticles
dc.subjectscattering
dc.subjectsilica
dc.subjecttitanium oxides
dc.subjectrandomness
dc.subjectvisible radiation
dc.subjectfluorescence
dc.subjectlight transmission
dc.subjectwavelengths
dc.subjectwave functions
dc.titleCore-shell (TiO2@Silica) nanoparticles for random laserspt_BR
dc.typeTexto completo de eventopt_BR
dspace.entity.typePublication
ipen.autorERNESTO JIMENEZ VILLAR
ipen.autorNIKLAUS URSUS WETTER
ipen.codigoautor14647
ipen.codigoautor919
ipen.contributor.ipenauthorERNESTO JIMENEZ VILLAR
ipen.contributor.ipenauthorNIKLAUS URSUS WETTER
ipen.date.recebimento18-09pt_BR
ipen.event.datapadronizada2018pt_BR
ipen.identifier.ipendoc24949pt_BR
ipen.identifier.ods7
ipen.notas.internasProceedingspt_BR
ipen.type.genreArtigo
relation.isAuthorOfPublication2add7063-89f6-4497-8137-6fc6b4bbc93c
relation.isAuthorOfPublication464db0c6-6072-480b-b899-81848893f7eb
relation.isAuthorOfPublication.latestForDiscovery2add7063-89f6-4497-8137-6fc6b4bbc93c
sigepi.autor.atividadeJIMENEZ-VILLAR, E.:14647:910:Spt_BR
sigepi.autor.atividadeWETTER, N.U.:919:910:Npt_BR
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