Distribution characteristics of intensity and phase vortices of speckle fields produced by N-pinhole random screens

doi:10.1088/1674-1056/24/9/094202

Abstract

We analyze the distribution properties of phase and phase vortices in a speckle field generated by N-pinhole random screens, and find that the phase vortex distributions show similarity and clustering in local regions. The phase patterns have a lot of sets composed of two phase vortices with opposite signs or four phase vortices which are positive and negative vortices alternately. Cases are also found where two adjacent phase vortices have the same topological charges. The density of phase vortices becomes larger with the increase of the radius of circumference and the number of pinholes on screen. Then, the relative positions of phase vortices can be adjusted by changing the radius of circumference and the number of pinholes.

Keywords: speckle field phase vortices intensity distribution

Received: 22 October 2014
Revised: 02 April 2015
Accepted manuscript online:

PACS:	42.25.Fx	(Diffraction and scattering)
	42.30.Ms	(Speckle and moiré patterns)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11404179).

Corresponding Authors: Liu Man, Cheng Chuan-Fu
E-mail: lium7879@163.com;chengchuanfu@sdnu.edu.cn

Cite this article:

Liu Man (刘曼), Cheng Chuan-Fu (程传福), Ren Xiao-Rong (任晓荣) Distribution characteristics of intensity and phase vortices of speckle fields produced by N-pinhole random screens 2015 Chin. Phys. B 24 094202

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Distribution characteristics of intensity and phase vortices of speckle fields produced by N-pinhole random screens

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