柱矢量涡旋光束强聚焦特性的修正研究  

Amendment for Tightly Focusing of Cylindrically Polarized Vortex Beams

作　　者：刘键[1] 杨艳芳[1] 何英[1] 刘国威[1] 郑晓[1] 

机构地区：[1]上海大学理学院物理系,上海200444

出　　处：《光子学报》2014年第7期194-199,共6页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61108010;11204170);上海市自然科学基金(No.11R1412300)资助

摘　　要：对现有柱矢量涡旋光束强聚焦公式的不足进行修正,数值模拟了不同拓扑核柱矢量涡旋光束的强聚焦场分布.结果表明:调节偏振旋转角、数值孔径以及遮挡通光孔径可以有效地构造平顶光束与暗通道.调节偏振旋转角能改变涡旋光束径向部分与角向部分的相对强度,实现平顶聚焦;增加孔径遮挡值可以在相对较小的数值孔径下形成平顶光束.当孔径遮挡较大时可以在高数值孔径下实现更窄的暗通道.Considering the radial component and azimuthal component of the vortex beam in focusing contribution, the tightly focusing formula of Cylindrical Vortex Beams（CVB） was amended. The CVB focusing intensity distribution was afresh investigated in the focal region by using amendatory tightly focusing formula. The results show that the flat-topped focus and the focal hole are proposed by adjusting the Polarization Rotation（PR） angle, Numerical-Aperture（NA） and the Aperture Blocking（AB）. The adjustably confined flat-topped focus can be generated by adjusting PR angle. And the flat-topped focus can be obtained for the relative small NA with the increasing of AB. The narrower focal hole can be obtained in the higher NA when AB is larger.

关 键 词：物理光学 偏振 涡旋光束 拓扑核 平顶光束 暗通道 

分 类 号：O436[机械工程—光学工程]