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Effects of carrier and dispersion on propagation of a directed electromagnetic pulse

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1 Author(s)
Hafizi, B. ; Icarus Research, 7113 Exfair Road, Bethesda, Maryland 20814

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Propagation of a directed pulse of electromagnetic radiation in a vacuum and in a rarefied, temporally dispersive medium is investigated. The pulse belongs to the class of broadband directed radiation beams termed electromagnetic ‘‘missiles’’ and is superposed on a carrier wave. First the propagation characteristics of the pulse in a vacuum are reviewed. In a vacuum the far‐field time‐integrated Poynting flux U(z) of the pulse drops off as 1/z1+4ν, with ∥ν∥≤1/4. In the corresponding expression for U(z) in a dispersive medium the leading term also varies as 1/z1+4ν since the high‐frequency end of the spectrum experiences very little dispersion. In a dispersive medium the propagation of the precursors and of the carrier signal is examined in certain limits and expressions for the spatial variation of the vector potential are given.

Published in:

Journal of Applied Physics  (Volume:73 ,  Issue: 2 )