Theory of electromagnetic wave frequency upconversion in dynamic media
Plasma Physics
2018-08-14 v2 Optics
Abstract
Frequency upconversion of an electromagnetic wave can occur in ionized plasma with decreasing electric permittivity and in split-ring resonator-structure metamaterials with decreasing magnetic permeability. We develop a general theory to describe the evolution of the wave frequency, amplitude, and energy density in homogeneous media with a temporally decreasing refractive index. We find that upconversion of the wave frequency is necessarily accompanied by partitioning of the wave energy into low-frequency modes, which sets an upper limit on the energy conversion efficiency. The efficiency limits are obtained for both varying permittivity and varying permeability.
Cite
@article{arxiv.1804.07358,
title = {Theory of electromagnetic wave frequency upconversion in dynamic media},
author = {Kenan Qu and Qing Jia and Matthew R. Edwards and Nathaniel J. Fisch},
journal= {arXiv preprint arXiv:1804.07358},
year = {2018}
}
Comments
7 pages, 2 figures