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 mW launched into the tapered fiber

a single SiO

2

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.