中国物理B ›› 2010, Vol. 19 ›› Issue (12): 124001-124001.doi: 10.1088/1674-1056/19/12/124001

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Polarization singularities in near-field of Gaussian vortex beam diffracted by a circular aperture

李建龙   

  1. College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
  • 收稿日期:2010-04-08 修回日期:2010-05-27 出版日期:2010-12-15 发布日期:2010-12-15
  • 基金资助:
    Project supported by the China Postdoctoral Science Foundation (Grant No. 2009450159), and the Foundation of the State Key Laboratory of Optical Technologies for Micro-Frabrication and Micro-Engineering, Chinese Academy of Sciences (Grant No. KF001).

Polarization singularities in near-field of Gaussian vortex beam diffracted by a circular aperture

Li Jian-Long(李建龙)†   

  1. College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
  • Received:2010-04-08 Revised:2010-05-27 Online:2010-12-15 Published:2010-12-15
  • Supported by:
    Project supported by the China Postdoctoral Science Foundation (Grant No. 2009450159), and the Foundation of the State Key Laboratory of Optical Technologies for Micro-Frabrication and Micro-Engineering, Chinese Academy of Sciences (Grant No. KF001).

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摘要： Polarization singularities in the near-field of Gaussian vortex beams diffracted by a circular aperture are studied by a rigorous electromagnetic theory. It is shown that there exist C-points and L-lines, which depend on off-axis displacement parameters along the x and y directions, waist width, wavelength, and topological charge of the diffracted Gaussian vortex beam, as well as on propagation distance. The results are illustrated by numerical calculations.

Abstract: Polarization singularities in the near-field of Gaussian vortex beams diffracted by a circular aperture are studied by a rigorous electromagnetic theory. It is shown that there exist C-points and L-lines, which depend on off-axis displacement parameters along the x and y directions, waist width, wavelength, and topological charge of the diffracted Gaussian vortex beam, as well as on propagation distance. The results are illustrated by numerical calculations.

Key words: polarization singularities, rigorous electromagnetic field theory, Gaussian vortex beams

中图分类号:  (Ordinary and partial differential equations; boundary value problems)

  • 02.60.Lj
42.25.Fx (Diffraction and scattering) 42.25.Ja (Polarization) 42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)