Radiation forces on a Rayleigh dielectric sphere produced by highly focused parabolic scaling Bessel beams

Appl Opt. 2017 Feb 20;56(6):1763-1767. doi: 10.1364/AO.56.001763.

Abstract

The radiation forces on a Rayleigh dielectric particle induced by a highly focused parabolic scaling Bessel beam (PSBB) are investigated. Numerical results show that the zero-order PSBB can be used to trap a high-index particle at the focus and near the focus by the first-order PSBB. For the low-index particle, it can be guided or confined in the dark core of the nonzero-order PSBB but cannot be stably trapped in this single-beam trap. Further, we analyze the condition of trapping stability. It is found that the lower limit in the particle radius for stable trapping is different for different orders.