色散超材料中的电磁能量
Electromagnetic energy in a dispersive metamaterial
摘要：
推导了由开口环谐振器阵列和导线阵列组成的色散、有耗、左手超材料中电磁场能量密度的表达式。考虑了具有一般时间依赖性的电磁场。结果与以前发表的结果进行了比较。在没有损失的情况下，与色散材料中能量密度的一般结果一致。用时域有限差分（FDTD）数值方法对公式进行了验证。两种常用的磁导率模型的适用性的问题，计算存储在一个阵列的开口环谐振器的能量进行了讨论。
英文摘要：
An expression for the electromagnetic field energy density in a dispersive, lossy, left-handed metamaterial, consisting of an array of split-ring resonators and an array of wires is derived. An electromagnetic field with general time-dependence is considered. The outcome is compared with previously published results. In the absence of losses, agreement with the general result for the energy density in a dispersive material is obtained. The formulae are verified using the finite-difference time-domain (FDTD) numerical method. The applicability of two commonly used permeability models to the problem of calculating the energy stored in an array of split-ring resonators is discussed.
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