摘要
在涡旋光场中相位奇点的传输特性是研发基于复杂光场的新型光电子器件的关键,而离轴相位奇点在汇聚涡旋光中的传输机理至今还未被阐明.该文针对这一课题展开研究,基于近轴传输方程直接推导了相位奇点在任意宿主光束中的轨迹方程;并证明在汇聚高斯光束中焦场附近的离轴涡旋点做随光束同步缩放的螺旋状运动.但该结论与波束传输法仿真得到的结果相矛盾,后者表明离轴相位奇点沿直线穿过光束截面.为解决上述矛盾,该文进行了相关实验研究,证明了离轴涡旋点在焦场附近的螺旋状轨迹.该研究成果可推广至多个相位奇点并存的情形,为有效辨识和操控复杂光场中的相位奇点奠定理论基础.
The transmission characteristics of phase singularities in vortex light fields are crucial for developing novel optoelectronic devices based on complex optical fields.However,the transmission mechanism of off-axis phase singularities in converging vortex beams remains unclear.The issue is systematically addressed by deriving a trajectory model for phase singularities in arbitrary host beams based on the paraxial transmission equation.It is demonstrated that in a converging Gaussian beam the trajectory of an off-axis vortex point near the focal region exhibits a spiral pattern that scales with the beam.However,this conclusion contradicts the results of the widely used Beam Propagation Method(BPM),which predicts that the off-axis phase singularity travels along a straight-line trajectory through the beam cross-section.To resolve this discrepancy,relevant experimental studies are designed and conducted,confirming the spiral motion of off-axis vortex points near the focal region.The findings of this work can be extended to cases involving multiple phase singularities,providing a theoretical foundation for effectively identifying and controlling the trajectories of phase singularities in complex optical fields.
作者
王溢秋
刘志鹏
靳琪琳
殷澄
单鸣雷
韩庆邦
WANG Yiqiu;LIU Zhipeng;JIN Qilin;YIN Cheng;SHAN Minglei;HAN Qingbang(College of Information Science and Engineering,Hohai University,Changzhou Jiangsu 213251,China)
出处
《江西师范大学学报(自然科学版)》
北大核心
2025年第2期128-133,共6页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
南通市自然科学基金(JC2023081)
国家自然科学基金(12404530)资助项目
关键词
涡旋光束
离轴相位奇点
焦场
vortex beam
off-axis phase singularity
focused field
