Radiation force of highly focused modified hollow Gaussian beams on a Rayleigh particle

The radiation force on a Rayleigh dielectric particle produced by highly focused modified hollow Gaussian (MHG) beams is investigated numerically and theoretically. The results show that the highly focused MHG beams can be used to trap and manipulate the particles with low or high index of refractive larger than that of ambient at the focus point and in the neighbourhood of the focal plane simultaneously in the different region. Also, the conditions for trapping stability are analyzed in this paper.