紧聚焦混合阶庞加莱光的自旋密度

孙宏; 董光炯

doi:10.3969/j.issn.1000-5641.201922012

紧聚焦混合阶庞加莱光的自旋密度

doi: 10.3969/j.issn.1000-5641.201922012

孙宏,
董光炯^,

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

基金项目: 国家自然科学基金(11574085, 91536218, 11834003); 上海市教委科研创新计划(2019-01-07-00-05-E00079)

详细信息

通讯作者:
董光炯, 男, 教授, 博士生导师, 研究方向为量子光学. E-mail: gjdong@phy.ecnu.edu.cn

中图分类号: O436.1
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- 被引次数: 0
出版历程
- 收稿日期: 2019-05-02
- 刊出日期: 2020-03-01

Spin density of tightly focused hybrid-order Poincaré beams

SUN Hong,
DONG Guangjiong^,

State Key Laboratory of Precision Spectoscopy, East China Normal University, Shanghai　200062, China

摘要

摘要: 庞加莱光自旋密度分布的研究不仅有着实际的工程应用意义, 还对认识光的本性有着重要的意义. 研究了紧聚焦的混合阶庞加莱光的自旋密度, 发现它不仅有横向分量, 还有纵向分量; 与最近的研究总纵向自旋为零的紧聚焦满庞加莱光束不同, 其纵向总自旋不等于零. 紧聚焦的混合阶庞加莱光的自旋密度具有丰富的可调控的空间斑图, 特别是纵向自旋密度可以是环形, 还可以是正多边形等. 这些特征可用于手性微粒的光力学分离和操控, 也可用于产生等效磁场操控超冷旋量原子气体动力学.
- 混合阶庞加莱光 /
- 紧聚焦 /
- 自旋密度
Abstract: Research on spin of Poincaré beams not only has practical engineering applications, but is also important for understanding the nature of light. In this paper, we study the spin density of the tightly focused hybrid-order Poincaré beams (TFPB) and find that it has both longitudinal and transverse components. Unlike tightly focused full Poincaré beams whose longitudinal spin density is on average zero, the total longitudinal spin density of tightly focused hybrid-order Poincaré beams is not zero. The spin density of TFPB has rich controllable spatial patterns; in particular, the longitudinal spin density can be either a ring shape or a regular polygon. These features can be used to separate chiral particles or to manipulate dynamics of ultracold spinot gases.
- hybrid-order Poincaré beams /
- tightly focused /
- spin density

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图 1 一混合阶庞加莱光入射到一个高数值孔径的透镜, 在焦平面得到紧聚焦庞加莱光

Fig. 1 A hybrid order Poincaré beams is incident on a lens with a high numerical aperture, at the focal plane, a tightly focused Poincaré optical field can be generated

下载: 全尺寸图片幻灯片

图 2 $m = n$时, 焦平面处自旋密度${{S}}$的3个分量${{{S}}_x}$,${{{S}}_y}$,${{{S}}_z}$的空间分布

Fig. 2 Spatial distribution of three components of the spin density S at the focal plan, ${{{S}}_x}$, ${{{S}}_y}$, ${{{S}}_z}$ for the case $m = n$

下载: 全尺寸图片幻灯片

图 3 m ≠ n 时, 焦平面处自旋密度$S $的3个分量${{{S}}_x}$,${{{S}}_y}$,${{{S}}_z}$的空间分布

Fig. 3 Spatial distribution of three components of the spin density S at the focal plan, ${{{S}}_x}$, ${{{S}}_y}$, ${{{S}}_z}$ for the case $m \ne n$

下载: 全尺寸图片幻灯片

图 4 $m = - 5,n = - 7$时, 不同数值孔径 (${\rm{NA}} $)条件下, 焦平面处自旋密度 S 的3个分量${{{S}}_x}$,${{{S}}_y}$,${{{S}}_z}$的空间分布

Fig. 4 Spatial distribution of three components of the spin density S at the focal plan${{{S}}_x}$, ${{{S}}_y}$, ${{{S}}_z}$ for the case$m = - 5,n = - 7$ with different numerical aperture values (${\rm{NA}} $)

下载: 全尺寸图片幻灯片

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