In a previous paper [ Phys. Rev. 138, B1561 (
1965)] some new results were presented
relating to the structure of the electromagnetic field near the focus of a
coherent beam emerging from an aplanatic optical system. The present paper
supplements the previous one by providing detailed analysis of the behavior of
the Poynting vector in the focal region of such a beam. In particular, diagrams
showing the flow lines and the contours of constant amplitude of the
time-averaged Poynting vector are given. The energy flow is found to have
vortices near certain points of the focal plane. Two diagrams showing the
behavior of the flow near a typical vortex are also included.
© 1967 Optical Society of America
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