Abstract
Optical vortex carries an annular spatial form and an orbital angular momentum (OAM) assigned by a topological charge ℓ owing to its helical wavefront, and it has been widely studied in a variety of applications, such as optical manipulation [1], optical communications [2], and material processing [3]. Visible optical vortex, in particular, is strongly required in underwater communications [4], and optical data storage [5] with the freedom of OAM.
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