Perfect Lensing by a Single Interface: Defying Loss and Bandwidth Limitations of Metamaterials.
Perfect Lensing by a Single Interface: Defying Loss and Bandwidth Limitations of Metamaterials.
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DOI：
10.1103/physrevlett.115.195504
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发表时间：
2015-11
影响因子：
8.6
通讯作者：
G. Rosenblatt;M. Orenstein
中科院分区：
文献类型：
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作者：
G. Rosenblatt;M. Orenstein
已知损耗对于用迄今为止提出的无源完美透镜设计实现完美聚焦是有害的，并且据信其构成基本障碍。我们表明，完美的透镜可以实现与实际的有损左手材料，而不需要增益或非线性。所提出的无损完美透镜由源侧上的常规介电材料和像侧上的有损耗左手材料之间的单个界面组成。它对材料损耗的免疫力是使用三种互补方法分析得出的，证实了具有点对点精度的完美透镜效应，并揭示了底层的聚焦机制。这一结果为基于单界面透镜设计的近场相机的实际实现提供了新的路线图。
Loss is known to be detrimental for achieving perfect focusing with the passive perfect lens designs suggested thus far, and it is believed to pose a fundamental barrier. We show that perfect lensing can be achieved with actual lossy left-handed metamaterials, without a need for gain or nonlinearity. The proposed loss-immune perfect lens is composed of a single interface between a conventional dielectric material on the source side and a lossy left-handed material on the image side. Its immunity to material loss was derived analytically using three complementary methodologies, confirming perfect lensing with point-to-point accuracy and shedding light on the underlying focusing mechanism. This result provides a new road map for practical realization of a near-field camera based on the single-interface lens design.