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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Localization of light induced in ordered colloidal suspensions: powerful sensing tools

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Autor(es):
Ermakov, Viktor A. [1, 2] ; Martins, Weliton S. [3] ; Wetter, Niklaus U. [4] ; Marques, Francisco C. [1] ; Jimenez-Villar, Ernesto [1, 5, 4]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Fed Rural Pernambuco, Programa Posgrad Engn Fis, Unidade Acad Cabo de Santo Agostinho, BR-51518430 Cabo De Santo Agostinho, PE - Brazil
[4] CNEN IPEN, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo, SP - Brazil
[5] Univ Fed Paraiba, Dept Fis, BR-58051970 Joao Pessoa, Paraiba - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: NANOSCALE; v. 13, n. 13, p. 6417-6425, APR 7 2021.
Citações Web of Science: 0
Resumo

We study the light-matter coupling by Raman scattering in colloidal suspensions composed by core-shell TiO2@Silica (Rutile@Silica) nanoparticles suspended in ethanol and water solutions. Strong enhancement of the Raman signal per particle is observed as {[}TiO2@Silica] is increased above a threshold, being stronger in ethanol suspensions. Moreover, above this {[}TiO2@Silica] threshold, the optical transmittance of the ethanol suspension starts to be considerably lower than in water, despite scattering strength being higher in water. These results are attributed to localization of light induced by strong correlation in the scatterers' position as a consequence of the long-range Coulomb interaction between the TiO2@Silica nanoparticles. Light diffraction in TiO2@Silica suspensions (water and ethanol) shows strong correlation in the scatterers' position (structure seemingly cubic), being stronger in ethanol than in water (longer-range Coulomb interaction). As a result, we demonstrate in these colloidal suspensions for the first time, to our knowledge, strongly enhanced light-matter coupling through correlation-induced localization with kl(T) much higher than unity and in an ordered colloidal-photonic structure. This strong enhancement of light-matter coupling by localization of light opens an avenue for manufacturing powerful sensing tools. (AU)

Processo FAPESP: 17/10765-5 - Lasers com alta eficiência e baixo limiar de operação em meios espalhadores e transparentes
Beneficiário:Niklaus Ursus Wetter
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 17/05854-9 - Localização de luz: uma maneira para construção de dispositivos fotônicos avançados
Beneficiário:Niklaus Ursus Wetter
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional