Two dimensional vortex lattices from pure wavefront tilts

A new method of generation of two dimensional vortex lattices is described. In this method, different parts of the wavefront are given different local tilts to realize vortex lattice in the propagated field. These linear phase variations corresponding to tilts in different locations of the wavefront are created using a spatial light modulator (SLM). The diffracted field from the SLM is found to contain vortex lattice and the presence of these vortices is confirmed experimentally. Computational results are also provided.