Journal
NANOSCALE
Volume 5, Issue 24, Pages 12192-12199Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr03644h
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Funding
- Universidad Autonoma de Madrid
- Comunidad Autonoma de Madrid [S2009/MAT-1756]
- Spanish Ministerio de Educacion y Ciencia [MAT2010-16161]
- Fundacion Dr Manuel Morales
- Spanish Ministerio de Economia y competitividad (MINECO)
- Concordia University
- Natural Science and Engineering Research Council (NSERC) of Canada
- Marie Curie Fellowship Program [FP7-PEOPLE-2010- IOF-274404]
- EPSRC [EP/J01771X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J01771X/1] Funding Source: researchfish
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We report on the first experimental observation of stable optical trapping of dielectric NaYF4:Er3+,Yb3+ upconverting fluorescent nanoparticles (similar to 26 nm in diameter) using a continuous wave 980 nm single-beam laser. The laser serves both to optically trap and to excite visible luminescence from the nanoparticles. Sequential loading of individual nanoparticles into the trap is observed from the analysis of the emitted luminescence. We demonstrate that the trapping strength and the number of individual nanoparticles trapped are dictated by both the laser power and nanoparticle density. The possible contribution of thermal effects has been investigated by performing trapping experiment in both heavy water and into distilled water. For the case of heavy water, thermal gradients are negligible and optical forces dominate the trap loading behaviour. The results provide a promising path towards real three dimensional manipulation of single NaYF4:Er3+,Yb3+ nanoparticles for precise fluorescence sensing in biophotonics experiments.
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