中文摘要：

提出了一个同时俘获两个Rayleigh粒子的光学俘获模型．用一束双环形拉盖尔高斯（LG10）径向偏振光入射到高数值孔径的亚波长菲涅耳波带片（SFZP）上，利用角谱理论计算波带片后的衍射场分布．结果显示，通过调节入射光的截断参数（β），在近场区和菲涅尔衍射区产生了两个绕光轴旋转对称的亮斑．两个亮斑均可以用来同时俘获Ray leigh粒子．最后讨论了俘获精度和俘获的稳定性．

英文摘要：

A model of optical trapping two high refractive index Rayleigh particles simultaneously is proposed. A double-ring-shaped Laguerre-Gaussian （LG10） radially polarized beam is incident on a subwavelength Fresnel zone plate （SFZP）. Based on the angular spectrum theory, the diffraction field distribution of the SFZP is calculated. Calculation results shown that, by changing the truncation parameter （β） of the incident beam, two cylindrically symmetric bright spots are generated in the near-field region and in Fresnel-diffraction region, respectively, which can be used to simultaneously trap two Rayleigh particles. The trapping accuracy and stability are also discussed in this paper.