中国物理B ›› 2019, Vol. 28 ›› Issue (3): 34205-034205.doi: 10.1088/1674-1056/28/3/034205
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Propagation dynamics of off-axis noncanonical vortices in a collimated Gaussian beam
Cheng Yin(殷澄), Xuefen Kan(阚雪芬), Hailang Dai(戴海浪), Minglei Shan(单鸣雷), Qingbang Han(韩庆邦), Zhuangqi Cao(曹庄琪)
- 1 Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, Hohai University, Changzhou 213022, China;
2 The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai JiaoTong University, Shanghai 200240, China
Propagation dynamics of off-axis noncanonical vortices in a collimated Gaussian beam
Cheng Yin(殷澄)1,2, Xuefen Kan(阚雪芬)1, Hailang Dai(戴海浪)2, Minglei Shan(单鸣雷)1, Qingbang Han(韩庆邦)1, Zhuangqi Cao(曹庄琪)2
- 1 Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, Hohai University, Changzhou 213022, China;
2 The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai JiaoTong University, Shanghai 200240, China
摘要：
It is widely accepted that an off-axis noncanonical vortex moves across the free-space diffracting Gaussian beam without rotation. But our analysis shows that the vortex swirls a while before it approaches infinite. By neglecting the divergence of the host beam, we focus on this rotation characteristics of the vortices in linear homogeneous media. For the symmetrical host beam, it is found that the vortex moves along an elliptical trajectory, while the topological charge and the angular momentum of the vortex core relative to the beam axis are conserved. For the asymmetrical host beam, the vortex trajectory is rather complicated, since the noncanonical parameter varies as the light propagates, resulting in topological charge inversion. But we find that the vortices are always confined in a rectangular area, and the rotation direction is determined by the topological charge.
中图分类号: (Optical angular momentum and its quantum aspects)
- 42.50.Tx