The tailoring effect of two symmetrically distributed vortices on circular Airy beam

Abstract

We investigate the tailoring effect of the point vortices on the foci of the circular Airy vortex beam (CAVB). Two optical vortices (OVs) with same or opposite topological charges (TCs) are symmetrically loaded on the beam. It is found that the loading distance between these two OVs (denoted as dv) can significantly tailor the auto-focusing behaviour of the beam. For two OVs with same TCs, as dv increases from 0 to infinite, the intensity pattern at the focal plane changes from a ring to a bright spot. For opposite OVs, when dv is near 0 or very large, there is a bright foci. But within a certain range, two foci are generated at the focal plane. Good agreements have been achieved between simulations and experiments. We qualitatively explain the tailoring phenomena from the perspective of the inward energy flow of the main ring of CAVB and the interaction between two OVs. The tailoring effect of dv of the two OVs on the focal pattern may have potential applications in micromanipulation, communication and other fields.