Effectively left-handed (negative index) composite material
Effectively left-handed (negative index) composite material
复制标题
DOI：
10.1063/1.1505119
复制
发表时间：
2002-08
影响因子：
4
通讯作者：
D. Fredkin;A. Ron
中科院分区：
文献类型：
--
作者：
D. Fredkin;A. Ron
我们证明了具有负介电常数（e<0）和负磁导率（μ<0）交替层的层状材料在许多方面响应电磁场，就像e<0和μ<0的均匀左手材料一样。特别是，这种层状结构支持群速度与相速度反平行的电磁波。然而，散射矩阵的相敏测量将区分材料与均匀左手材料。在e和μ为负的频率上出现具有正折射率的模式（右手模式）是一个令人惊讶的特征。
We show that a layered material, with alternating layers having negative permittivity (e<0) and negative permeability (μ<0), responds to electromagnetic fields in many ways like a homogeneous left-handed material with e<0 and μ<0. In particular, such a layered structure supports electromagnetic waves with group velocity antiparallel to the phase velocity. However, phase-sensitive measurements of the scattering matrix would distinguish the material from a homogeneous left-handed material. The appearance of a mode with positive index of refraction (right-handed mode) at frequencies for which e and μ are negative is a surprising feature.