Abstract
In order to evaluate electromagnetic energy flow (EME) lines behind a circular disc illuminated by monochromatic laser light, the Rayleigh–Sommerfeld integral is transformed to a simpler form. EME flow lines, interpreted as photon trajectories, explain the change of the intensity pattern with the distance from a circular disc very well, including the Poisson–Arago spot in the center. Possible applications of these results on the study of Poisson–Arago spot experiments with matter beams, are indicated and explained.
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