| Texto completo | |
| Autor(es): |
Vivas, Marcelo Goncalves
;
Leandro De Sousa, Jose Carlos
;
De Boni, Leonardo
;
Schiavon, Marco Antonio
;
Mendonca, Cleber Renato
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MATERIALS; v. 10, n. 4 APR 2017. |
| Citações Web of Science: | 0 |
| Resumo | |
We report here on the direct observation of distinct two-photon transition channels in glutathione-capped (GSH) CdTe quantum dots (QDs) in a very strong confinement regime. CdTe-GSH QDs with different average diameters (2.5, 3.0, and 3.3 nm) were synthesized through the one-pot method and their two-photon absorption (2PA) spectrum determined by a femtosecond wavelength-tunable Z-scan. Our results show that the two lower-energy one-photon-allowed excitonic transitions, 1S(3/2)(h) -> 1S(e) and 2S(3/2)(h) -> 1S(e), are also accessed via 2PA. These results were ascribed to the relaxation of the parity selection rules due to the noncentrosymmetric structure of the CdTe QDs (zinc-blended structure), whose magnitude are determined by surface defects and structural irregularities present in CdTe-GSH QDs, in the strong confinement regime. (AU) | |
| Processo FAPESP: | 11/12399-0 - Aplicações de pulsos de femtossegundos em óptica não linear: espectroscopia, formatação de pulsos e microfabricação |
| Beneficiário: | Cleber Renato Mendonça |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 15/20032-0 - Estudo das Propriedades Ópticas Não Lineares e de Transporte de Carga de Moléculas Multiramificadas via Métodos de Química Quântica. |
| Beneficiário: | Daniel Luiz da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |