Acta Optica Sinica, Volume. 34, Issue 12, 1226001(2014)
Study on High-Numerical-Aperture-Focused Characteristics of Vector Beam Produced by π Phase Plate
Linear polarized light is converted to radial and angular vector hollow beams by using Mach-Zehnder interferometer light path with π phase plate. The distribution of the electromagnetic field focused with high numerical aperture is calculated by employing the Richards-Wolf classical vector diffraction model. The results show that the maximum intensity and intensity gradient of the axisymmetric vector hollow beam can respectively reach the magnitude of 1011 W·m-2 and 1017 W·m-3 under the illumination of laser with the power of 10-3 W magnitude, and the radius of the dark spot is only 0.24λ. Meanwhile, strong distributions of the longitudinal electric and magnetic fields are produced. The density distribution of the local photon orbital angular momentum can be adjusted by regulating the optical path difference of the interferometer. Therefore, this beam has good application prospect in atomic optics.
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Chen Guojun, Zhou Qiaoqiao, Ji Xianming, Yin Jianping. Study on High-Numerical-Aperture-Focused Characteristics of Vector Beam Produced by π Phase Plate[J]. Acta Optica Sinica, 2014, 34(12): 1226001
Category: Physical Optics
Received: Jul. 15, 2014
Accepted: --
Published Online: Nov. 25, 2014
The Author Email: Guojun Chen (cgj5866530@sina.com)