Anisotropic coding metamaterials and their powerful manipulation of differently polarized terahertz waves.
Anisotropic coding metamaterials and their powerful manipulation of differently polarized terahertz waves.
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各向异性编码超材料及其对不同偏振太赫兹波的强大操纵
DOI：
10.1038/lsa.2016.76
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发表时间：
2016-05
期刊：
影响因子：
--
通讯作者：
Cheng Q
中科院分区：
文献类型：
--
作者：
Liu S;Cui TJ;Xu Q;Bao D;Du L;Wan X;Tang WX;Ouyang C;Zhou XY;Yuan H;Ma HF;Jiang WX;Han J;Zhang W;Cheng Q
基于有效介质的超材料可以用来产生许多不寻常的物理特性（例如，负折射和隐形斗篷），因为它们可以用自然界中不存在的有效介质参数进行定制。最近，已经建议使用编码超材料，通过使用具有相反相位响应的数字元件“0”和“1”设计编码序列来控制电磁波。在这里，我们提出了各向异性编码超材料的概念，其中在不同方向上的编码行为取决于电磁波的偏振状态。我们通过实验证明了一种灵活的偏振控制的各向异性编码超颖表面，其功能在太赫兹制度使用专门设计的编码元件。通过用精心设计的编码序列（1位和2位序列）对元件进行编码，x偏振波和y偏振波可以在三维中被反射或独立地漫射。模拟的远场散射图案和近场分布，以说明编码的超颖表面的双重功能的性能，并与测量结果是一致的。我们进一步证明了各向异性编码超颖表面产生分束器并同时实现异常反射和偏振转换的能力，从而提供了对不同偏振电磁波的强大控制。所提出的方法，使通用的光束行为下的正交偏振使用一个单一的元表面，并有可能用于开发有趣的太赫兹器件。
Metamaterials based on effective media can be used to produce a number of unusual physical properties (for example, negative refraction and invisibility cloaking) because they can be tailored with effective medium parameters that do not occur in nature. Recently, the use of coding metamaterials has been suggested for the control of electromagnetic waves through the design of coding sequences using digital elements ‘0’and ‘1,'which possess opposite phase responses. Here we propose the concept of an anisotropic coding metamaterial in which the coding behaviors in different directions are dependent on the polarization status of the electromagnetic waves. We experimentally demonstrate an ultrathin and flexible polarization-controlled anisotropic coding metasurface that functions in the terahertz regime using specially designed coding elements. By encoding the elements with elaborately designed coding sequences (both 1-bit and 2-bit sequences), the x-and y-polarized waves can be anomalously reflected or independently diffused in three dimensions. The simulated far-field scattering patterns and near-field distributions are presented to illustrate the dual-functional performance of the encoded metasurface, and the results are consistent with the measured results. We further demonstrate the ability of the anisotropic coding metasurfaces to generate a beam splitter and realize simultaneous anomalous reflections and polarization conversions, thus providing powerful control of differently polarized electromagnetic waves. The proposed method enables versatile beam behaviors under orthogonal polarizations using a single metasurface and has the potential for use in the development of interesting terahertz devices.
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