Open AccessFOCUS SHAPING OF CYLINDRICALLY POLARIZED VORTEX BEAMS BY A LINEAR AXICON
Author(s) -
Abdu A. Alkelly,
Ibrahim G. H. Loqman,
Hassan T. Al-Ahsab
Publication year - 2021
Publication title -
mağallaẗ ğāmiʿaẗ ʿadan li-l-ʿulūm al-asāsiyyaẗ wa-al-taṭbīqiyyaẗ
Language(s) - English
Resource type - Journals
ISSN - 2708-0684
DOI - 10.47372/ejua-ba.2021.4.122
Subject(s) - axicon , optics , physics , polarization (electrochemistry) , vortex , optical vortex , diffraction , linear polarization , numerical aperture , cardinal point , optical tweezers , focus (optics) , aperture (computer memory) , depth of focus (tectonics) , laser , laser beams , beam (structure) , wavelength , paleontology , chemistry , tectonics , subduction , biology , acoustics , thermodynamics
Focus shaping of cylindrically polarized vortex beams (CPVBs) by linear axicon is studied theoretically. Vector diffraction theory has been used to derive the expressions of the light field in the focal region. It is shown that a different intensity distribution in the focal region can be obtained by adjusting the topological charge, the polarization rotation angle and the numerical aperture maximal angle. A focal spot, a dark channel and a flat-topped shapes are formed by choosing proper values of parameters. A controllable polarization state of dark channel is obtained. The different focal region shapes may find wide applications such as material processing and optical tweezers.