Investigating the self-healing property of radially self-accelerating beam

We experimentally investigated the self-healing property of radially self-accelerating beam (RSAB). RSAB is a kind of nondiffracting self-accelerating beam, which can accelerate along helical trajectories and keep shape invariants in propagation. It can be produced by the superposition of two or more Bessel beams. We experimentally generated several RSABs by superposition of a small number of Bessel beams and studied the self-healing property of RSAB under two different perturbations. One case of perturbations is that the obstacle is localized on-axis and blocks the central part; the other case is where the obstacle partially blocks the off-axis part. The results obtained in both perturbations show that the RSAB can self-reconstruct after propagating certain distances, which is in good agreement with numerical simulations. The results show that RSAB possesses the same self-healing ability as Bessel beams.