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Nonparaxial beam conversion: optical magnus effect in a free space

In a free space, it may be created any singular beam field distributions but far from all those fields are generic beams, i.e. beams to be steady state with respect to small perturbations of beam parameters or a distance from an optical transparence or a hologram. In the given paper it is considered those explicit solutions of Maxwell's equations that are unstable for signs variations of a spin or a topological charge of singular beams in a free space. Those beam modes change their intrinsic structure on a wave propagation. So, the sum of E- and H-types of linearly polarized non-paraxial optical vortices form nongeneric beam modes that have a pure screw dislocation far from a focal plane. Near a beam waist, the pure screw dislocation transforms into a pure edge dislocation and recoveries again its initial structure on its further propagation. Due to a sign variation both a vortex spin and a topological charge, an edge dislocation sense rotates at 90 angular degrees -- the optical Magnus effect 'in a void.'