Propagation velocity of a surface polariton.
The concept of irreversible and reversible powers and that of real and reactive powers are developed with particular reference to the surface polariton. The characteristics of the surface polariton excited by a current source are obtained. The limitations of the various propagation velocities are examined. It is shown that in the frequency range where the surface polariton is transparent, a physically meaningful transport velocity, or equivalently wave packet velocity, does not exist.
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Seshadri