Gradient index metamaterials
Gradient index metamaterials
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DOI：
10.1103/physreve.71.036609
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发表时间：
2005-03-01
影响因子：
2.4
通讯作者：
Schurig, D
中科院分区：
文献类型：
--
作者：
Smith, DR;Mock, JJ;Schurig, D
超材料-具有定制电磁响应的人工结构材料-可以设计成具有传统材料制造方法难以或不可能实现的特性。在这里，我们提出了一种结构化的超材料，基于导电开口环谐振器（SRR），它具有一个恒定的空间梯度的有效折射率。我们通过测量微波束在微波频率范围内的复合超材料的平板的偏转，实验证实了梯度。梯度折射率超材料可以证明是开发梯度折射率透镜和类似光学器件的有利替代方法，特别是在较高频率下。特别是，我们提出的梯度折射率超材料可能适用于太赫兹应用，其中磁共振响应的SRR最近已被证明。
Metamaterials-artificially structured materials with tailored electromagnetic response-can be designed to have properties difficult or impossible to achieve with traditional materials fabrication methods. Here we present a structured metamaterial, based on conducting split ring resonators (SRRs), which has an effective index of refraction with a constant spatial gradient. We experimentally confirm the gradient by measuring the deflection of a microwave beam by a planar slab of the composite metamaterial over a range of microwave frequencies. The gradient index metamaterial may prove an advantageous alternative approach to the development of gradient index lenses and similar optics, especially at higher frequencies. In particular, the gradient index metamaterial we propose may be suited for terahertz applications, where the magnetic resonant response of SRRs has recently been demonstrated.