摘要
光学斯格明子为实现结构光场以及时空光场的拓扑属性提供了新的研究方法与研究思路。本文在4π聚焦系统中,通过对两对入射柱矢量光束进行偏振与相位调控,实现了聚焦光场纵向分量与横向分量的独立控制,在焦平面上得到了Néel型与Bloch型的电磁矢量光学斯格明子。在4π聚焦系统内调控两对反向传播的径向偏振光时,焦平面处将产生Néel型的电场矢量斯格明子。将其中一对替换为角向偏振光时,焦平面处将同时产生Bloch型的电场矢量斯格明子与相位超前π/2的磁场矢量斯格明子。本工作为进一步研究自由空间中微纳尺度电磁矢量光学斯格明子与物质的相互作用提供了理论基础。
Optical skyrmions provide a new idea and approach to endow structured light and spatial-temporal light with topological properties.In this paper,the longitudinal and transversal components of the focused light field are decoupled and can be controlled independently by modulating the polarizations and phases of two pairs of counterpropagating incident cylindrical vector beams under 4πfocal configuration.Under this condition,Néel-type and Bloch-type optical skyrmions formed by electromagnetic field vectors are constructed in the focal plane.When one pair of the incident beams is radially polarized with a phase difference ofπand the other pair is radially polarized in phase,a Néel-type optical skyrmion formed by electric field vectors can be constructed in the focal plane of the 4πfocal system.The corresponding focal magnetic field is purely azimuthally polarized.If we substitute the other pair of the incident beams with azimuthally polarized beams,Bloch-type optical skyrmions formed by electromagnetic field vectors can be constructed in the focal plane,where the one formed by magnetic field vectors has aπ/2 phase lead compared with the that formed by electric field vectors.This work provides a theoretical basis for further research on the interactions between matter and optical skyrmions formed by electromagnetic field vectors at micro and nano scales in free space.
作者
孙家琳
王思聪
周志凯
郑泽灿
姜美玲
宋世超
邓子岚
秦飞
曹耀宇
李向平
Sun Jialin;Wang Sicong;Zhou Zhikai;Zheng Zecan;Jiang Meiling;Song Shichao;Deng ZiLan;Qin Fei;Cao Yaoyu;Li Xiangping(Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications,Institute of Photonics Technology,Jinan University,Guangzhou,Guangdong 510632,China)
出处
《光电工程》
CAS
CSCD
北大核心
2023年第6期95-104,共10页
Opto-Electronic Engineering
基金
国家重点研发计划(2021YFB2802003)
国家自然科学基金(61975066,62075084,62075085,62005104)
广东省基础与应用基础研究基金(2021A1515011586,2020A1515010615,2020B1515020058)
广州市科技计划(202002030258)。
关键词
矢量光场
4π聚焦
光学斯格明子
vector beams
4πfocal configurations
optical skyrmions
