Multiple optical spin-orbit Hall effect at the tight focus

We reveal that a multiple optical spin-orbit Hall effect occurs at the tight focus of light fields with hybrid m-th order polarization thanks to spin-orbit coupling and angular momentum conservation, or symmetry violation (e.g. at non-integer m). The effect manifests itself through the formation of multiple, spatially separated subwavelength regions such that circular and elliptical polarization vectors in adjacent regions are oppositely directed, with the corresponding on-axis components of the spin angular momenta being opposite in sign. Besides, subwavelength regions are formed where transverse energy flows rotate along closed paths, being oppositely directed in the adjacent regions. The optical spin-orbit Hall effect occurs at the tight focus of a cylindrical m-th order vector field if cylindrical symmetry is violated by one way or another.