Abstract
We report on a novel optical vortex, named as centrosymmetric optical vortex (CSOV), which is constructed via four conventional optical vortices (OVs) with different topological charges (TCs). The orbital angular momentum (OAM) density satisfies centrosymmetric distribution. Meanwhile, it is confined within a single ring whose radius is determined by the cone angle of an axicon. Furthermore, its magnitude and distribution are modulated by a parameter determined via the TCs of the four OVs, named as phase reconstruction factor. Our work provides a novel detached asymmetric light field, which possesses the potential application in macro-particle manipulation, especially separating cells.
Highlights
Optical vortex carrying orbital angular momentum (OAM) has been extensively studied in particle manipulation [1,2,3], high capacity optical communication [4,5,6,7], optical measurements [8,9], and astronomical observations [10]
To enrich the mode distributions of the asymmetric light fields, we propose a centrosymmetric optical vortex (CSOV) by joining four local spiral phases
Our work provides a special light field distribution which is of significance in micro-fabrication, micro-particle manipulations, especially separating cells
Summary
Optical vortex carrying orbital angular momentum (OAM) has been extensively studied in particle manipulation [1,2,3], high capacity optical communication [4,5,6,7], optical measurements [8,9], and astronomical observations [10]. In the field of particle manipulation, intensity and OAM of the optical vortex (OV) provide gradient force and azimuthal light spanner force, respectively. It is significant to study the modulation techniques of the intensity and OAM distributions. The distribution of OAM cannot be modulated via this method, which limits the universality of its application in micro-particle manipulations. To break this limitation, the asymmetric (i.e., non-circular symmetry) OV attracted diverse attentions. For the generation of asymmetric OVs, one method is to inset an extra factor into the conventional OVs
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