Electromagnetic radiation in a time-varying background medium
| Autor: | Budko, Neil V. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 80, 053817 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.80.053817 |
| Popis: | 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 spatio-temporal modulation, which are analized 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. Comment: 17 pages, no figures |
| Databáze: | arXiv |
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