Optical Instruments, Volume. 47, Issue 1, 65(2025)
Optical force of azimuthally polarized circular Airy beams with a first order vortex on Rayleigh particles
In this paper, the optical force characteristics of the azimuthally polarized circular Airy beams with a first order vortex on Rayleigh particles are studied in detail. The introduction of orbital angular momentum leads to the localization of the spin angular momentum in the focal plane of the azimuthally polarized beam. The polarization singularity disappears and the original dark focal spot becomes a bright focal spot. In this paper, the influence of different beam parameters on the auto-focusing characteristics of the circular airy beams was calculated and analyzed by using the vector Rayleigh-Sommerfeld diffraction integral. Then, the scattering force and gradient force distribution of glass particles and bubbles in the focal area were calculated, and the trap stiffness at different force equilibrium positions was analyzed. The results show that the vector circularly Airy beams can efficiently confine glass particles in both longitudinal and transverse directions, with much lower intensity requirements than Gaussian beams under the same conditions. For bubbles, the vector circularly Airy beams can only maintain the confinement in the longitudinal direction, and the intensity requirement is much larger than that of the glass particles, while the Gaussian beam with the same condition cannot confine the bubbles.
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Yiqian ZHU, Tao GENG. Optical force of azimuthally polarized circular Airy beams with a first order vortex on Rayleigh particles[J]. Optical Instruments, 2025, 47(1): 65
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Received: Jan. 30, 2024
Accepted: --
Published Online: Apr. 1, 2025
The Author Email: GENG Tao (Gengtao@usst.edu.cn)