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

ISSN号：1674-1056
期刊名称：Chinese Physics B
时间：0
页码：-
分类：O436.3[机械工程—光学工程;理学—光学;理学—物理] TN820.15[电子电信—信息与通信工程]
作者机构：[1]College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
相关基金：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）.
相关项目：具有轨道角动量的部分相干矢量涡旋光束的研究

作者： Shu Jian-Hua|Chen Zi-Yang|Pu Ji-Xiong|Liu Yong-Xin|

关键词： Fresnel波带板, 光束聚焦特性, 部分偏振光, 二元, 旋涡, 高数值孔径, 电场分量, 入射光束, partially polarized vortex beams, high numerical aperture, binary phase Fresnel zoneplates

中文摘要：

<正>Based on vectorial Debye theory,the focusing properties of partially polarized vortex beam by high numerical aperture Presnel zone plate are investigated.The effects of the numerical apertures of and the phase difference of binary phase Presnel 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 E_x,E_y and E_z are completely coherent everywhere in the focal region if the incident light beam is linearly polarized.

英文摘要：

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.

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