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. 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
  • 收稿日期:2018-09-20 修回日期:2018-11-29 出版日期:2019-03-05 发布日期:2019-03-05
  • 通讯作者: Cheng Yin E-mail:cyin.phys@gmail.com
  • 基金资助:

    Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 2017B14914), China Postdoctoral Science Foundation (Grant No. 2016M601586), and the National Natural Science Foundation of China (Grant Nos. 11874140 and 11404092).

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. 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
  • Received:2018-09-20 Revised:2018-11-29 Online:2019-03-05 Published:2019-03-05
  • Contact: Cheng Yin E-mail:cyin.phys@gmail.com
  • Supported by:

    Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 2017B14914), China Postdoctoral Science Foundation (Grant No. 2016M601586), and the National Natural Science Foundation of China (Grant Nos. 11874140 and 11404092).

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.

关键词: noncanonical optical vortex, topological charge inversion

Abstract:

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.

Key words: noncanonical optical vortex, topological charge inversion

中图分类号:  (Optical angular momentum and its quantum aspects)

  • 42.50.Tx
47.32.C- (Vortex dynamics)