Radiation forces of focused partially coherent vortex beams on a dielectric sphere

The radiation forces of focused partially coherent Bessel vortex beams on a dielectric sphere in the Rayleigh scattering regime are theoretically investigated. Numerical results demonstrate that the magnitude of the radiation forces on a dielectric sphere near the focus point decreases as the topological charge, the coherence length or the parameter α increases. When the topological charge n=0,1, the stable three-dimensional trap can be obtained, and can be used to manipulate the particle with a refractive index lower than that of the ambient media.