  Here we highlight enantioselective optical gradient forces present in 3D
structured optical vortex tweezing systems. One chiral force originates from
the circular polarization of the light, while remarkably the other is
independent of the input polarization, even occurring for unpolarized light,
and is not present in 2D structured light nor propagating plane waves. This
latter chiral sorting mechanism allows for the enantioselective trapping of
chiral particles into distinct rings in the transverse plane through
conservative radial forces.
