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Chin. Phys. B, 2011, Vol. 20(11): 114202    DOI: 10.1088/1674-1056/20/11/114202
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

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)
College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
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.
Keywords:  partially polarized vortex beams      high numerical aperture      binary phase Fresnel zone plates  
Received:  21 March 2011      Revised:  18 May 2011      Accepted manuscript online: 
PACS:  42.25.Ja (Polarization)  
  42.25.Fx (Diffraction and scattering)  
Fund: 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).

Cite this article: 

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) Tight focusing of partially polarized vortex beams by binary phase Fresnel zone plates 2011 Chin. Phys. B 20 114202

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