Electromagnetic field energy in dispersive materials

被引：23
|
作者：
Webb, Kevin J. [1 ]
Shivanand [1 ]
机构：
[1] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA
来源：
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2010年 / 27卷 / 06期
基金：
美国国家科学基金会;
关键词：
DENSITY;
D O I：
10.1364/JOSAB.27.001215
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A general expression for the electromagnetic energy density in a lossy dispersive medium, applicable for a field having a narrow temporal frequency bandwidth, is derived and compared with exact results for an example dielectric constant. Consequently, the possibility of negative time-averaged stored field energy is shown to have physical meaning. This observation is of interest in the study of dispersive metamaterials, such as those which can exhibit a negative refractive index. (C) 2010 Optical Society of America
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页码：1215 / 1220
页数：6
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