Abstract

Tractor beams have received increasing attention. The generation of tractor beams is an important issue in practical applications. In this paper, Pancharatnam-Berry (PB) metasurfaces were designed to generate non-paraxial Bessel tractor beams. The optical pulling forces (OPFs) exerted on dielectric particles with specific radii on the axis of the non-paraxial Bessel beam were obtained. The presence of OPFs depended on the size of the particles, indicating the potential of the non-paraxial Bessel tractor beam for separating particles. Such a feature illustrated the possibility of selective optical manipulation and sorting. This setup of metasurface has good potential in such aspects as lab-on-a-chip.

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