Raghunathan, S.B. (author), Schouten, H.F. (author), Visser, T.D. (author) We demonstrate that coherence vortices, singularities of the correlation function, generally occur in partially coherent electromagnetic beams. In successive cross sections of Gaussian Schell-model beams, their locus is found to be a closed string. These coherence singularities have implications for both interference experiments and correlation...
journal article 2012