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It is known that internal energy flow in a light beam can be divided into theorbital flow, associated with the macroscopic energy redistribution within thebeam, and the spin flow originating from instantaneous rotation of the fieldvectors inherent in circular or elliptic polarization. In contrast to theorbital one, experimental observation of the spin flow constituent seemedproblematic because (i) it does not manifest itself in the visibletransformation of the beam profile and (ii) it converts into the orbital flowupon tight focusing of the beam, usually employed for the energy flow detectionby the mechanical action on probe particles. We propose a two-beam interferencetechnique that permits to obtain appreciable level of the spin flow inmoderately focused beams and to detect the orbital motion of probe particleswithin a field where the transverse energy circulation is associatedexclusively with the spin flow. This result can be treated as the firstdemonstration of mechanical action of the spin flow of a light field.

Orbital rotation without orbital angular momentum: mechanical action of the spin part of the internal energy flow