Experimental verification of SAM-OAM coupling of tightly focused elliptically polarized light

Polarized beams, such as circularly polarized beams and linearly polarized beams, have been found to be able to automatically move particles under the tight focusing condition. Birefringent and metallic particles were rotated by tightly focused circularly polarized beam owing to the spin angular momentum (SAM)-orbital angular momentum (OAM) coupling. In this paper we investigated both theoretically and experimentally the revolution behavior of a dielectric particle under the tightly focused elliptically polarized beam which has different focusing property from that of the circularly and linearly polarized beams. The phase distribution of the elliptically polarized beam after focusing exhibits the vortex pattern, but the gradual change in phase distribution is inhomogeneous. The revolution induced by the Gaussian beam was explained with the phase distribution of the beam.