Loss-Induced Omnidirectional Bending to the Normal in ε-Near-Zero Metamaterials
Loss-Induced Omnidirectional Bending to the Normal in ε-Near-Zero Metamaterials
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DOI：
10.1103/physrevlett.108.193904
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发表时间：
2012-05-10
影响因子：
8.6
通讯作者：
Feng, Simin
中科院分区：
文献类型：
--
作者：
Feng, Simin
与光从高折射率介质传递到低折射率介质时会偏离法线的传统观点相反，这里我们展示了一种奇异的现象，即当光从任意高折射率介质（或空气）入射到ε近零（ENZ）超材料时，电磁功率的方向可以向法线弯曲。此外，对于所有入射角，传输方向都接近法线。这种反斯涅耳定律折射是 ENZ 与材料损失之间相互作用的结果。该损耗可以增加空气-ENZ 界面处的传输并准直 ENZ 介质内的光束。此外，在理想的损耗配置中，当材料损耗趋于无穷大时，各向异性 ENZ 材料中的传播损耗可以接近零。
Contrary to conventional wisdom that light bends away from the normal when it passes from high to low refractive index media, here we demonstrate an exotic phenomenon that the direction of electromagnetic power can bend toward the normal when light is incident from an arbitrary high refractive index medium (or air) to a epsilon-near-zero (ENZ) metamaterial. Moreover, the direction of the transmission is close to the normal for all angles of incidence. This anti-Snell's law refraction results from the interplay between ENZ and material loss. The loss can increase the transmission at the air-ENZ interface and collimate the beam inside the ENZ medium. Furthermore, in an ideal loss configuration, the propagation loss in anisotropic ENZ materials can approach zero when the material loss goes to infinity.