Electromagnetic radiation in a time-varying background medium

被引:27
|
作者
Budko, Neil V. [1 ]
机构
[1] Delft Univ Technol, Fac Elect Engn Math & Comp Sci, Lab Electromagnet Res, NL-2628 CD Delft, Netherlands
来源
PHYSICAL REVIEW A | 2009年 / 80卷 / 05期
关键词
electromagnetic waves; magnetic permeability; Maxwell equations; permittivity; spatiotemporal phenomena; spectral line shift; WAVE;
D O I
10.1103/PhysRevA.80.053817
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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.
引用
收藏
页数:8
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