一阶涡旋角向偏振圆对称艾里光束对瑞利粒子光力的研究  

Optical force of azimuthally polarized circular Airy beams with a first order vortex on Rayleigh particles

作　　者：朱仡谦 耿滔[1] ZHU Yiqian;GENG Tao(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2025年第1期65-71,78,共8页Optical Instruments

基　　金：国家自然科学基金(61975125);上海市自然科学基金(21ZR1443800)。

摘　　要：详细研究了一阶涡旋角向偏振圆对称艾里光束对瑞利颗粒的光力特性。轨道角动量的引入导致角向偏振光束焦平面自旋角动量局域化,使得偏振奇点消失,原先的暗焦斑变为亮焦斑。首先使用矢量瑞利-索末菲衍射积分,计算分析了不同光束参数对矢量圆对称艾里光束的自聚焦特性影响。然后计算了玻璃微粒和气泡在焦点区域的散射力和梯度力分布,分析了不同受力平衡位置的光阱刚度。研究结果表明,矢量圆对称光束可以在纵向和横向上高效地束缚玻璃微粒,光强要求远低于同等条件的高斯光束。对于气泡,矢量圆对称光束只能保持纵向的束缚,且对光强的要求要远大于玻璃微粒,而同等条件的高斯光束无法束缚气泡。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.

关 键 词：圆对称艾里光 角向偏振 微粒操作 

分 类 号：O436.1[机械工程—光学工程]