Controllable autofocusing properties of conical circular Airy beams

In this paper, we propose a new family of circular Airy beam (CAB) through introducing a cone angle. We investigate the autofocusing properties of such conical circular Airy beam (CCAB) both analytically and numerically, particularly focusing on the novel behaviors different from the case of the conventional CAB. Under the action of positive cone angles, the autofocusing effect of CCAB is greatly strengthened, and the focal length is remarkably reduced, as compared to the case of conventional CAB. On the other hand, the autofocusing effect may be weakened or even completely eliminated, and the focal length is largely extended under the action of negative cone angles. Therefore, such dramatic enhancement or suppression of abruptly focus can be effectively controlled through adjusting the cone angle. The novel autofocusing properties will make CCAB more powerful in various applied fields including optical trapping and particle manipulation.