Chen Yi, Huang Sujuan, Chen Musheng, Liu Xianpeng
J Opt Soc Am A Opt Image Sci Vis. 2018 Sep 1;35(9):1585-1591. doi: 10.1364/JOSAA.35.001585.
Hybridly polarized Laguerre-Gaussian vector beams (HPLGVBs) with zero radial index are obtained based on the third type of Laguerre-Gaussian vector beams. Polarization distributions of HPLGVBs are controlled by the phase retardation of a wave plate. The ellipticity angle and polarization orientation angle are used to describe the polarization distributions of the HPLGVBs. The electric field intensity distributions of tightly focused HPLGVBs are analyzed in the focal plane by the Richards-Wolf vectorial diffraction method. It is found that the tightly focused HPLGVBs have a focal shift phenomenon. The dependence of the focal shift of the HPLGVBs on the different parameters is discussed in detail. The simulation results show that the magnitude of the focal shift is related to the polarization distribution, and the focal shift is quite obvious for large azimuthal mode index, long focal length, large numerical aperture, and narrow beam waist. The effective control of the focal shift will have great potential applications in optical micromanipulation.
基于第三类拉盖尔 - 高斯矢量光束获得了径向指数为零的混合偏振拉盖尔 - 高斯矢量光束（HPLGVBs）。HPLGVBs的偏振分布由波片的相位延迟控制。椭圆率角和偏振取向角用于描述HPLGVBs的偏振分布。采用理查兹 - 沃尔夫矢量衍射方法分析了紧聚焦HPLGVBs在焦平面的电场强度分布。发现紧聚焦HPLGVBs存在焦移现象。详细讨论了HPLGVBs焦移对不同参数的依赖性。模拟结果表明，焦移的大小与偏振分布有关，对于大角向模式指数、长焦长、大数值孔径和窄束腰，焦移非常明显。焦移的有效控制在光学微操纵中将具有巨大的潜在应用。
