Negative refractive index in left-handed materials
Negative refractive index in left-handed materials
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DOI：
10.1103/physrevlett.85.2933
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发表时间：
2000-10-02
影响因子：
8.6
通讯作者：
Kroll, N
中科院分区：
文献类型：
--
作者：
Smith, DR;Kroll, N
几乎透明且无源介质的折射率n(omega)的实部通常被认为仅具有正值。通过对辐射到一维“左手”材料 (LHM)（其中介电常数和磁导率同时小于零）的电流源的分析，我们确定了 n(w) 的解析结构，证明了 Re[n(w)] 的符号实际上必须为负的频率区域。负指数的状态，与最近有效的 LHM 的演示相关，导致了不寻常的电磁波传播，值得进一步探索。
The real part of the refractive index n(omega) of a nearly transparent and passive medium is usually taken to have only positive values. Through an analysis of a current source radiating into a 1D "left-handed" material (LHM)-where the permittivity and permeability are simultaneously less than zero-we determine the analytic structure of n(w), demonstrating frequency regions where the sign of Re[n(w)] must, in fact, be negative. The regime of negative index, made relevant by a recent demonstration of an effective LHM, leads to unusual electromagnetic wave propagation and merits further exploration.