Chinese Optics Letters, Volume. 23, Issue 10, (2025)
Tunable autofocus and unconventional OAM through dislocation in superimposed swallowtail vortex beam [Early Posting]
Autofocusing beams are powerful photonic tools for manipulating micro/nanoparticles. Here,we propose a special type of dislocated-superimposed swallowtail vortex beams (DSVBs) and analyze their propagation properties and optical manipulating capability. By modulating the parameters the superposition number N and the topological charge l, DSVBs show asymmetric propagation phenomena and unconventional orbital angular momentum(OAM) , especially for the case of opposite topo-logical charges. Furthermore, when N=l, DSVBs forms multiple solid focuses but keeps OAM in the propagation, which are superior for optical trapping and rotating.These results deepen the under-standing of autofocusing and OAM behaviors, highlighting DSVBs' potential as photonic tools for opticalmanipulation.