用弧形波晶片产生矢量光束及其强聚焦的特性研究  

Study on the properties of vector beams generated by a curved wave plate in the strong-focusing regime

作　　者：周巧巧[1] 施建珍[1] 纪宪明[1,2] 印建平[2] 

机构地区：[1]南通大学理学院,南通226019 [2]华东师范大学精密光谱科学与技术国家重点实验室,上海200062

出　　处：《物理学报》2015年第5期140-147,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11034002;11274114);科技部量子调控重大研究计划项目(批准号:2011CB921602);华东师范大学精密光谱科学与技术国家重点实验室开放基金资助的课题~~

摘　　要：提出了产生轴对称矢量光束的新方案,根据晶体的双折射性质设计波晶片,形成o光和e光相位板,能够把线偏振光转换为具有旋转对称性的径向或角向矢量空心光束,光路简单,调节方便.应用Richards-Wolf的经典矢量衍射模型,分析计算了空心高斯光束照明、高数值孔径透镜聚焦条件下所产生的衍射光波电磁场分布,结果表明:用功率为0.5 W的激光照明,所获得的矢量空心光束具有很高的光强、光强梯度和很强的纵向电磁场分布,同时还能产生可实时调控的光子角动量分布,方案在微观粒子的操控方面有很好的应用前景.We propose a new scheme to generate the axisymmetric vector beam. A curved wave plate, designed by using the birefringence properties of a crystal, can generate two different phase distributions with respect to the o-light and e- light, and it then can transform the linearly polarized light into the radial or azimuthal vector beam with the property of rotational symmetry. The above scheme has the advantage of having a simple light path and can be adjusted conveniently. According to Richards-Wolf＇s model of the classical vector diffraction, we calculate the distributions of the diffracted electromagnetic field that is illuminated by a hollow Gaussian beam and focused by a lens with high numerical aperture. Results show that the hollow vector beam has a very high intensity and intensity gradient and longitudinal distribution of the electric or magnetic field even if illuminated by the laser with a power of 0.5 W. In addition, real-time adjusted distributions of the photon angular momentum can be generated. This scheme has good application prospects in the manipulations of the microscopic particles.

关 键 词：矢量光束 原子光学 波晶片 空心高斯光束 

分 类 号：O562.3[理学—原子与分子物理]