| Full text | |
| Author(s): |
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
Total Authors: 9
|
| Document type: | Journal article |
| Source: | Nano Letters; v. 24, n. 12, p. 8-pg., 2024-03-18. |
| Abstract | |
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) | |
| FAPESP's process: | 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis |
| Grantee: | Osvaldo Novais de Oliveira Junior |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/12588-9 - Optical biosensors for the fast detection of pathogenic bacteria |
| Grantee: | Marylyn Setsuko Arai |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass |
| Grantee: | Edgar Dutra Zanotto |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |