M.Berry was the first who paid attension to the possibility of dislocation-like defects in electromagnetic fields1. He showed under the scalar approximation, that different surprises can be wating for us even in rather simple sistems (including linear ones) that were traditionally studied, and rich variety of singular structures has been demonstrated. In Ref.2, the complex amhlitude distribution of a monochromatic field is discussed, that obeys to the parabolic equation, in connection with the problem on the existance of points where the amplitude vanishes. It has been shown zero lines are any continous lines in 3-D space where the wavefront has the screw dislocation. Generation of wave-front defects was studied by numerous investigators, as well as the fine polarization structure of electromagnetic fields3-7.
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O. V. Angelsky, "About thin structure of speckle field," Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27784W (1 September 1996);