Chinese Optics Letters, Volume. 23, Issue 10, (2025)

Tunable autofocus and unconventional OAM through dislocation in superimposed swallowtail vortex beam [Early Posting]

Tang Xiaoying, Liu Nana, Liu Shunyu, Wang Nan, Jiang Shaozhou, Ren Yu-Xuan, Hong Peilong, Liang Yi
Author Affiliations
  • Guangxi University School of Physical Science and Technology
  • China
  • Fudan University
  • Guangxi University
  • show less

    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.

    Paper Information

    Manuscript Accepted: May. 14, 2025

    Posted: Jun. 5, 2025

    DOI: 10.3788/COL202523.100005