Optical confined nanoparticles on a nanofiber microring with a microparticle decorated the junction

This work demonstrates optical trapping and transportation of nanoparticles along a nanofiber microring. The optical fiber, 800 nm in diameter, was formed to be a microring with a bending radius of about 42 μm. A microparticle, stuck to the junction of the ring, plays a critical role for confining nanoparticles on the microring. The experimental results show that, when a 650 nm laser light was launched into the ring, nanoparticles dispersed in the solution were trapped to the ring surface and delivered along the direction of the light propagation. Because the stuck microparticle on the junction for perturbation, nanoparticles can be confined over entire microring circumference. This technology offers a new degree of control for particles and lead to various nanomanipulation applictions.