Electromagnetic radiation in a time-varying background medium

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    Analytical solutions are presented for the electromagnetic radiation by an arbitrary pulsed source into a homogeneous time-varying background medium. In the constant-impedance case an explicit radiation formula is obtained for the synchronous permittivity and permeability described by any positive function of time. As might be expected, such a medium introduces significant spectral shifts and spatiotemporal modulation, which are analyzed here for the linear and exponential time variations of the medium parameters. In the varying-impedance case the solution is obtained for the fourth-order polynomial time dependence of the permittivity. In addition to the spectral shifts and modulation this spatially homogeneous medium scatters the field introducing causal echoes at the receiver location.
    Original languageUndefined/Unknown
    Pages (from-to)1-8
    Number of pages8
    JournalPhysical Review A (Atomic, Molecular and Optical Physics)
    Issue number5
    Publication statusPublished - 2009


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