中国物理B ›› 2021, Vol. 30 ›› Issue (10): 104203-104203.doi: 10.1088/1674-1056/abec32

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Settled fast measurement of topological charge by direct extraction of plane wave from vortex beam

Xiao-Bo Yang(杨晓波)1,2,3 and Jin Hu(胡进)1,3,†   

  1. 1 School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China;
    2 Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100195, China;
    3 China Beijing Key Laboratory of Fractional Signals and Systems, Beijing 100081, China
  • 收稿日期:2021-01-04 修回日期:2021-02-24 接受日期:2021-03-05 出版日期:2021-09-17 发布日期:2021-09-30
  • 通讯作者: Jin Hu E-mail:bithj@bit.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61975015, 61575022, and 61421001) and the Beijing Natural Science Foundation, China (Grant No. L191004).

Settled fast measurement of topological charge by direct extraction of plane wave from vortex beam

Xiao-Bo Yang(杨晓波)1,2,3 and Jin Hu(胡进)1,3,†   

  1. 1 School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China;
    2 Institute of Information Engineering, Chinese Academy of Sciences, Beijing 100195, China;
    3 China Beijing Key Laboratory of Fractional Signals and Systems, Beijing 100081, China
  • Received:2021-01-04 Revised:2021-02-24 Accepted:2021-03-05 Online:2021-09-17 Published:2021-09-30
  • Contact: Jin Hu E-mail:bithj@bit.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61975015, 61575022, and 61421001) and the Beijing Natural Science Foundation, China (Grant No. L191004).

摘要: A method of measuring the vortex beam topological charge (TC) is proposed based on a device that can directly extract the plane wave form from the vortex beam in which the different propagation angles of the plane waves are uniquely related to the different TCs. Then the TC can be obtained by simply comparing the energy values perceived by two fixed sensors in the detection location with the help of twin omnidirectional energy absorbers (OEAs). Because the settled detection relies only on the simple quantitative value at two fixed positions, neither pattern recognition nor field analysis procedure is applied, thus allowing faster measurement. Some features of the methodology are investigated, and the numerical simulations verify the feasibility and robustness of the system.

关键词: vortex beam, topological charge, settled measurement

Abstract: A method of measuring the vortex beam topological charge (TC) is proposed based on a device that can directly extract the plane wave form from the vortex beam in which the different propagation angles of the plane waves are uniquely related to the different TCs. Then the TC can be obtained by simply comparing the energy values perceived by two fixed sensors in the detection location with the help of twin omnidirectional energy absorbers (OEAs). Because the settled detection relies only on the simple quantitative value at two fixed positions, neither pattern recognition nor field analysis procedure is applied, thus allowing faster measurement. Some features of the methodology are investigated, and the numerical simulations verify the feasibility and robustness of the system.

Key words: vortex beam, topological charge, settled measurement

中图分类号:  (Wave optics)

  • 42.25.-p
42.30.Kq (Fourier optics) 41.20.Jb (Electromagnetic wave propagation; radiowave propagation)