| Texto completo | |
| Autor(es): |
Zhang, Fengchan
;
Oiticica, Pedro Ramon Almeida
;
Abad-Arredondo, Jaime
;
Arai, Marylyn Setsuko
;
Oliveira Jr, Osvaldo N.
;
Jaque, Daniel
;
Dominguez, Antonio I. Fernandez
;
de Camargo, Andrea Simone Stucchi
;
Haro-Gonzalez, Patricia
Número total de Autores: 9
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Nano Letters; v. 24, n. 12, p. 8-pg., 2024-03-18. |
| Resumo | |
Upconverting nanoparticles are essential in modern photonics due to their ability to convert infrared light to visible light. Despite their significance, they exhibit limited brightness, a key drawback that can be addressed by combining them with plasmonic nanoparticles. Plasmon-enhanced upconversion has been widely demonstrated in dry environments, where upconverting nanoparticles are immobilized, but constitutes a challenge in liquid media where Brownian motion competes against immobilization. This study employs optical tweezers for the three-dimensional manipulation of an individual upconverting nanoparticle, enabling the exploration of plasmon-enhanced upconversion luminescence in water. Contrary to expectation, experiments reveal a long-range (micrometer scale) and moderate (20%) enhancement in upconversion luminescence due to the plasmonic resonances of gold nanostructures. Comparison between experiments and numerical simulations evidences the key role of Brownian motion. It is demonstrated how the three-dimensional Brownian fluctuations of the upconverting nanoparticle lead to an "average effect" that explains the magnitude and spatial extension of luminescence enhancement. (AU) | |
| Processo FAPESP: | 18/22214-6 - Rumo à convergência de tecnologias: de sensores e biossensores à visualização de informação e aprendizado de máquina para análise de dados em diagnóstico clínico |
| Beneficiário: | Osvaldo Novais de Oliveira Junior |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/12588-9 - Biossensores ópticos para detecção rápida de bactérias patogênicas |
| Beneficiário: | Marylyn Setsuko Arai |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |