Control of the distribution of spin angular momentum density in optical vortex beams with partially transformed cylindrical polarization

Abstract

The combination of polarization and phase singularities in structured light fields can lead to various transformations in their structure. This enables the control of different characteristics of such structured light. In this paper, we numerically investigate the possibility of controlling the distribution of spin angular momentum (SAM) density in optical vortex (OV) beams with partially transformed cylindrical polarization. We examine the effects of the degree of transformation of cylindrical polarization and the topological charge of the OV beam on SAM distributions in both the focal and out-of-focal planes. Experimental studies conducted using a polarization video camera confirmed the polarization transformations. The results obtained enhance the understanding of the phase-polarization transformations that occur during the propagation and focusing of structured light, which can be beneficial in the fields of laser manipulation and the laser processing of photosensitive materials.