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In structured light tweezers, enhancing control precision and degrees of freedom in optical manipulation remains a significant technical challenge. Traditional optical tweezers, which rely on a three-dimensional adjustable displacement platform, inherently limit both control precision and degrees of freedom. In this study, we achieve controllable separation and precise manipulation of Rayleigh particles in three-dimensional space by modulating a partially coherent vortex beam using cross-phase. The cross-phase modulation induces controllable rotation and splitting in the intensity distribution of the partially coherent vortex beam, allowing flexible adjustment of the number and position of trapping points. Consequently, this enables precise manipulation of Rayleigh particles. Our findings demonstrate that coherence vortex structure engineering can be effectively employed in optical trapping, offering promising potential applications in particle manipulation.
Zhang et al. (Wed,) studied this question.