Dynamical beam manipulation based on 2-bit digitally-controlled coding metasurface.
Dynamical beam manipulation based on 2-bit digitally-controlled coding metasurface.
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DOI：
10.1038/srep42302
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发表时间：
2017-02-08
影响因子：
4.6
通讯作者：
Luo X
中科院分区：
文献类型：
--
作者：
Huang C;Sun B;Pan W;Cui J;Wu X;Luo X
最近，已经提出了数字超材料的概念，以通过数字超材料比特的适当空间混合来操纵场分布。本文提出了一种2位数控编码元表面的设计方案，可以有效地调制散射电磁波，实现不同的远场波束。该超表面的每个超原子集成了两个pin二极管，并且通过调谐它们的操作状态，该超表面具有0、π/2、π和3π/2的四个相位响应，分别对应于四个基本数字元素“00”、“01”、“10”和“11”。通过设计上述数字元件阵列的编码序列，可以任意控制反射光束。提出的2位数字元表面已被证明具有实现光束偏转，多光束和光束扩散的能力，这些不同的散射模式的动态切换是由一个可编程的电源完成。
Recently, a concept of digital metamaterials has been proposed to manipulate field distribution through proper spatial mixtures of digital metamaterial bits. Here, we present a design of 2-bit digitally-controlled coding metasurface that can effectively modulate the scattered electromagnetic wave and realize different far-field beams. Each meta-atom of this metasurface integrates two pin diodes, and by tuning their operating states, the metasurface has four phase responses of 0, π/2, π, and 3π/2, corresponding to four basic digital elements “00”, “01”, “10”, and “11”, respectively. By designing the coding sequence of the above digital element array, the reflected beam can be arbitrarily controlled. The proposed 2-bit digital metasurface has been demonstrated to possess capability of achieving beam deflection, multi-beam and beam diffusion, and the dynamical switching of these different scattering patterns is completed by a programmable electric source.