Title :
Group velocity in space-time periodic media
Author :
Chu, R.S. ; Tamir, Theodor
Author_Institution :
Polytechnic Institute of Brooklyn, Department of Electrophysics, Brooklyn, USA
Abstract :
The concept of the group velocity of electromagnetic fields is examined for waves that propagate through an isotropic lossless dielectric medium whose permittivity is varying periodically with respect to both space and time. It is found that the group velocity represents the velocity of energy transport averaged over the length of a periodicity cell.
Keywords :
electromagnetic fields; electromagnetic waves; elasto optic interactions; electromagnetic fields; group velocity; permittivity;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19710278
