具有交替单负层的层状复合材料的负折射率
Negative-Index Refraction in a Lamellar Composite with Alternating Single Negative Layers
摘要：
负折射率在具有ε负（ENG）和μ负（MNG）材料交替堆叠的层状复合材料中实现。基于有效介质近似，理论上得到了这种层状复合材料同时具有负的有效介电常数和磁导率，并通过全波模拟得到了进一步的证明。因此，包括开口环谐振器和导线的著名左手超材料被解释为这种ENG-MNG层状复合材料的类比。此外，在有效介质近似下，ENG/MNG界面附近的压缩传播场被证明是具有反向相速度的左手表面波。
英文摘要：
Negative-index refraction is achieved in a lamellar composite with epsilon-negative (ENG) and mu-negative (MNG) materials stacked alternatively. Based on the effective medium approximation, simultaneously negative effective permittivity and permeability of such a lamellar composite are obtained theoretically and further proven by full-wave simulations. Consequently, the famous left-handed metamaterial comprising split ring resonators and wires is interpreted as an analogy of such an ENG-MNG lamellar composite. In addition, beyond the effective medium approximation, the propagating field squeezed near the ENG/MNG interface is demonstrated to be left-handed surface waves with backward phase velocity.
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