Chiral Separation Induced by Chiral Optical Forces from Optical Bimeron

Optical topological quasiparticles have attracted considerable attention due to their unique topological properties. While much effort has been devoted to their generation, studies on the optical field characteristics and functional applications remain limited. In this work, we verified the chirality of optical Stokes bimeron and demonstrated the separation of chiral particles by means of this optical topological quasiparticle generating with a metasurface. Further results reveal that chirality of bimeron fields can enable selective manipulation and separation of chiral particles with opposite handedness. Furthermore, by introducing phase modulation, we achieve in-plane rotation of the bimeron optical field, thereby enabling dynamic control of the chiral particle trajectories, and it can produce a centrifugal-like effect with chiral-dependence. Our findings can be utilized as a versatile platform for chirality-based sorting, transport, and dynamic particle control.