Optical trapping of NaYF4:Er3+,Yb3+ upconverting fluorescent nanoparticles
Optical trapping of NaYF4:Er3+,Yb3+ upconverting fluorescent nanoparticles
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DOI：
10.1039/c3nr03644h
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Jaque, D.
中科院分区：
文献类型：
--
作者：
Haro-Gonzalez, P.;del Rosal, B.;Jaque, D.
我们报告的第一个实验观察稳定的光捕获的电介质NaYF4：Er3+，Yb3+上转换荧光纳米粒子（类似于26 nm的直径）使用连续波980 nm的单光束激光。激光器用于光学捕获和激发纳米颗粒的可见光。从发射的发光的分析中观察到单个纳米颗粒顺序装载到陷阱中。我们证明了捕获强度和被捕获的单个纳米颗粒的数量取决于激光功率和纳米颗粒密度。通过在重水和蒸馏水中进行捕集实验，研究了热效应的可能贡献。对于重水的情况下，热梯度可以忽略不计，光学力占主导地位的陷阱加载行为。这一结果为单NaYF 4：Er 3+，Yb 3+纳米粒子的真实的三维操控提供了一条有希望的途径，可用于生物光子学实验中的精确荧光传感。
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.