Multi-modal particle trapping via a vortex-loaded dual-ring Airy-Gaussian beam

Micro-manipulation, a cornerstone of structured light applications in biomedicine and microfluidics, necessitates beams adaptable to diverse operational demands. The double-ring Airy-Gaussian vortex beam (DRAGVB) provides an innovative solution, generating varied dynamical modes through tailored parameter selection. Notably, a continuous optical bottle structure, induced by uniform vortex interactions, facilitates the trapping and storage of multiple microparticles, with its spatial position and geometric properties adjustable via core parameter modulation to suit specific needs. Furthermore, a multi-point focusing structure, governed by the absolute difference in topological charges between inner and outer rings, enables precise microparticle capture at tunable focal plane positions, provided the charge difference exceeds one. Additionally, a distinctive structure driven by a single primary-secondary phase spiral produces photon helical convergence that spirals around the transmission axis, with its rotational direction and radius determined by the topological charge configuration, allowing for particle twisting and helical optical sieving. Micro-manipulation in the three modalities was experimentally realized, and their regulation mechanisms were deeply investigated. DRAGVB enables stronger trapping at lower powers, overcomes single-plane trapping and tunability limits of conventional structured light, and addresses the fixed-particle-count issue of annular beams, enabling flexible, controllable optical trapping and micro-manipulation.