Focusing properties of linearly polarized high order hyperbolic-cosine-Gaussian beam with sine-azimuthal wavefront modulated by multiple spiral optical vortices

Abstract

The tunable focusing properties of high order hyperbolic-cosine-Gaussian beams with sine-azimuthal wavefront modulated by multiple spiral optical vortices were investigated. Simulation results show that the focal patterns can be altered very considerably by changing the charge number of the optical vortex under a different phase parameter, the quantity of spiral optical vortices and the order parameter of high order hyperbolic-cosine-Gaussian beam. In addition to, some novel focal intensity distributions appeared. All of these special focal intensity patterns could be used to transfer information via optical communication; manipulate and trap nanometer-sized particles; generate spatial resolution beyond the diffraction limit; enable high-capacity wireless, fiber-optical; quantum communication; and contribute in small scale optical communication between chips. Besides, we verified the effects of the multiple spiral optical vortices that we proposed on the Gauss beam in the condition of lower numerical aperture, and the experimental results are basically consistent with the simulation results. On the basis of this experiment we can check the effects of the multiple spiral optical vortices on the high order hyperbolic-cosine-Gaussian beams with sine-azimuthal wavefront that we discussed in this paper.