中文摘要：

提出了利用锥形光纤对纳米颗粒进行振荡捕获的光操控方法。通过火焰加热技术将单模光纤拉制成尖端直径为1μm的锥形光纤,并且通入功率为30 m W,波长为808 nm的输入激光,溶液中的直径为800 nm的二氧化硅纳米颗粒受到沿锥形光纤方向的光学梯度力而被捕获,在锥形光纤末端焦点附近产生周期振荡现象。颗粒的振荡周期约为0.8 s,振荡中心距离锥形光纤尖端约为4.4μm,颗粒振荡振幅约为1.45μm。该方法有望对微纳颗粒及生物细胞进行振荡式的动态研究。

英文摘要：

This work provides an optical manipulation method for oscillating trapping of a single nanoparticle with a tapered optical fiber. The tapered optical fiber was drawn by a flame heating technique using a single-mode optical fiber with the diameter of the tapered end being 1 μm. With a laser beam at a wavelength of 808 nm and an optical power of 30 m W launched into the tapered fiber,a single Si O2 nanoparticle with a diameter of 800 nm is trapped by the optical gradient force along the tapered fiber direction. The trapping is a periodic oscillated near the focus point of the tapered fiber tip. The period of particle oscillation is about 0. 8 s,and the distance of the oscillation center is about 4. 4 μm to tapered fiber tip,while the particle oscillation amplitude is about 1. 45 μm. The method may provide an opportunity for the oscillating dynamic study of micro / nano particles and biological cells.