Optical trapping Rayleigh dielectric spheres with focused anomalous hollow beams.

Focusing properties of anomalous hollow beams (AHBs) are theoretically and numerically investigated. The radiation forces acting upon a Rayleigh dielectric sphere produced by focused AHBs are also studied. Results show that focused AHBs can be used to trap and manipulate microsized dielectric spheres with high-refractive index at the focal point. Finally, the stability conditions for effective trapping particles are analyzed in detail. The results presented here are of interest in some possible applications by making use of AHBs.