Propagation and focusing of optical vortex beams generated by generalized spiral phase plates
In contrast to the annular optical vortex beams generated by conventional spiral phase plates (SPPs), the light fields generated by generalized spiral phase plates (GSPPs) have a spiral-shaped intensity and phase distribution. It is well known that the increase in the number of angular harmonics in the angular harmonics spectrum of these vortex fields is associated with the growth rate of the phase function of the GSPP. Here, we investigate the propagation and modifications of such spiral-shaped vortices in space including the propagation through turbulent media. In addition, we investigate the focusing of the generated spiral-shaped vortices and show the possibility to control the intensity distribution along the generated light spiral. The results of the laser guiding of the polystyrene microspheres trapped by different light spirals are shown.
Image Processing Systems Institute of RAS—Branch of the FSRC “Crystallography and Photonics” RAS
File with report