Radiation forces of hypergeometric-Gaussian type-II beams acting on a Rayleigh dielectric sphere

摘要

We drive the analytical expressions for the propagation of hypergeometric-Gaussian typed-II (HyGG-II) beam passing through a paraxial ABCD optical system. The radiation forces of a strongly focused HyGG-II beam exerting on a Rayleigh dielectric sphere are theoretically and numerically investigated under the dipole approximation. The influences of optical parameters on the radiation forces are also discussed in detail. The results demonstrate that the HyGG-II beams can hold the micro particles with both high and low refractive index. Finally, we analyze the necessary conditions for stably trapping the particle.