中国物理B ›› 2011, Vol. 20 ›› Issue (11): 114202-114202.doi: 10.1088/1674-1056/20/11/114202

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Tight focusing of partially polarized vortex beams by binary phase Fresnel zone plates

舒建华, 陈子阳, 蒲继雄, 刘永欣   

  1. College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
  • 收稿日期:2011-03-21 修回日期:2011-05-18 出版日期:2011-11-15 发布日期:2011-11-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 60977068), the Open Research Fund of Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences (Grant No. SKLST200912), and the Overseas Chinese Affairs Office of the State Council (Grant No. 10QZR01).

Tight focusing of partially polarized vortex beams by binary phase Fresnel zone plates

Shu Jian-Hua(舒建华), Chen Zi-Yang(陈子阳),Pu Ji-Xiong(蒲继雄), and Liu Yong-Xin(刘永欣)   

  1. College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
  • Received:2011-03-21 Revised:2011-05-18 Online:2011-11-15 Published:2011-11-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 60977068), the Open Research Fund of Key Laboratory of Atmospheric Composition and Optical Radiation, Chinese Academy of Sciences (Grant No. SKLST200912), and the Overseas Chinese Affairs Office of the State Council (Grant No. 10QZR01).

摘要: Based on vectorial Debye theory, the focusing properties of partially polarized vortex beam by high numerical aperture Fresnel zone plate are investigated. The effects of the numerical apertures of and the phase difference of binary phase Fresnel zone plates, the topological charge of vortex beam and the degree of polarization of incident beam on the intensity distribution and degree of coherence in the focal plane are investigated in detail. It is shown that elliptical light spots and the flat top beam can be obtained by selecting certain parameters. Studies of degree of coherence reveal that the degree of coherence between x and y components of the electric field, which is zero in the source plane, is improved in the focal plane for vortex beam, but it is hardly changed for the nonvortex beam. It is also proved that any two of the three electric field components Ex, Ey and Ez are completely coherent everywhere in the focal region if the incident light beam is linearly polarized.

Abstract: Based on vectorial Debye theory, the focusing properties of partially polarized vortex beam by high numerical aperture Fresnel zone plate are investigated. The effects of the numerical apertures of and the phase difference of binary phase Fresnel zone plates, the topological charge of vortex beam and the degree of polarization of incident beam on the intensity distribution and degree of coherence in the focal plane are investigated in detail. It is shown that elliptical light spots and the flat top beam can be obtained by selecting certain parameters. Studies of degree of coherence reveal that the degree of coherence between x and y components of the electric field, which is zero in the source plane, is improved in the focal plane for vortex beam, but it is hardly changed for the nonvortex beam. It is also proved that any two of the three electric field components Ex, Ey and Ez are completely coherent everywhere in the focal region if the incident light beam is linearly polarized.

Key words: partially polarized vortex beams, high numerical aperture, binary phase Fresnel zone plates

中图分类号:  (Polarization)

  • 42.25.Ja
42.25.Fx (Diffraction and scattering)