Distribution characteristics of intensity and phase vortices of speckle fields produced by N-pinhole random screens
Liu Man†a),b), Cheng Chuan-Fu‡b), Ren Xiao-Rongb)
       
Distributions of phase and zero-crossings map of the real parts and the imaginary parts. (a) A pair of positive–negative phase vortices, (b) two positive phase vortices, (c) two pairs of positive–negative phase vortices, panels (a1), (b1), and (c1) are the zero lines of the real and the imaginary parts corresponding to panels (a), (b), and (c), respectively.