Evolution of spin density vectors in a strongly focused composite field  

作　　者：Xiaoyan Pang Chen Feng Xinying Zhao 庞晓炎;冯晨;赵馨颖(School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710072,China;School of Physics&Information Technology,Shaanxi Normal University,Xi’an 710061,China)

机构地区：[1]School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710072,China [2]School of Physics&Information Technology,Shaanxi Normal University,Xi’an 710061,China

出　　处：《Chinese Optics Letters》2021年第2期63-68,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(No.11974281);the Natural Science Basic Research Plan in Shaanxi Province of China(No.2020JM-116)。

摘　　要：The evolution of the spin density vectors(SDVs) is studied in a strongly focused composite field. It is found that the SDVs can be spiral along the propagation axis, and they are perpendicular to the ysdirection on the ysaxis. This behavior is governed by the Gouy phase difference between the field polarization components. The 60° rotation of the spatial distribution of the transverse SDVs is also generated, which is found to be controlled by the Gouy phase difference between the field orbital angular momentum modes. Additionally, the spin density singularities are observed in the evolution of the SDVs.

关 键 词：spin density Gouy phase orbital angular momentum spin angular momentum POLARIZATION 

分 类 号：O469[理学—凝聚态物理]