Abstract
A dispute about the existence of an additional time associated with the Goos-Hänchen shift has recently arisen. By analyzing light propagation in an optical planar waveguide with both the zigzag-ray model and the electromagnetic theory, we show in this paper that the Goos-Hänchen time really exists, and the total time delay upon total reflection is the sum of the group delay time and the Goos-Hänchen time. The causality paradox of total reflection of a TM wave upon an ideal nonabsorbing plasma mirror is also solved with the consideration of a negative Goos-Hänchen shift.
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