Evolution of the phase singularities in edge-diffracted optical-vortex beams
Abstract
We study, both theoretically and by experiment, migration of the amplitude zeros within a fixed cross section of the edge-diffracted optical-vortex beam, when the screen edge performs permanent translation in the transverse plane from the beam periphery towards the axis. Generally, the amplitude zeros (optical-vortex cores) describe spiral-like trajectories. When the screen edge advances uniformly, the motion of the amplitude zeros is not smooth and sometimes shows anomalously high rates, which make an impression of instantaneous "jumps" from one position to another. We analyze the nature, conditions and mechanism of these jumps and show that they are associated with the "birth - annihilation" topological reactions involving the optical vortex dipoles.
Cite
@article{arxiv.1605.06751,
title = {Evolution of the phase singularities in edge-diffracted optical-vortex beams},
author = {Aleksandr Bekshaev and Lidiya Mikhaylovskaya and Aleksey Chernykh and Anna Khoroshun},
journal= {arXiv preprint arXiv:1605.06751},
year = {2017}
}
Comments
3 pages, 3 figures. This is the enhanced abstract of the report submitted to the International Conference on Advanced Optoelectronics and Lasers CAOL 2016 (September, 2016, Odessa, Ukraine) and forms a continuation of the previous work arXiv:1511.01275