Compact e-shape metasurface with dual-band circular polarization conversion
Compact e-shape metasurface with dual-band circular polarization conversion
复制标题
具有双波段圆偏振转换的紧凑e形超表面
DOI：
10.1016/j.optcom.2016.06.046
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发表时间：
2016-12-15
影响因子：
2.4
通讯作者：
Zhang, Yongliang
中科院分区：
文献类型：
--
作者：
Cao, Hailin;Wu, Xiaodong;Zhang, Yongliang
提出了基于新型 e 形谐振器的双带圆偏振转换，并进行了数值和实验研究。模拟结果和实验结果吻合良好。在两个谐振频率，即11.65 GHz和13.02 GHz，入射的y方向线偏振波可以分别转换为右旋和左旋圆偏振波。所提出的结构可以传输近乎纯的圆偏振波，偏振消光比大于30 dB。此外，超表面结构紧凑，几何形状简单，不仅在传播方向上非常薄，而且在横向上也非常小。反演结果表明，e型结构的有效折射率在谐振频率附近接近负值。研究表面电流分布以说明极化转换机制。我们还分析了几个主要几何参数对调节偏振特性的影响。所提出的 e 形结构有望用于偏振控制器件的设计。 (C) 2016 Elsevier B.V. 保留所有权利。
Double-band circular polarization conversion based on novel e-shape resonators is proposed and studied both numerically and experimentally. Both the simulated results and experimental results are in good agreement. At two resonant frequencies, i.e., 11.65 GHz and 13.02 GHz, the incident y-direction linearly polarized wave can be transformed into right- and left-handed circularly polarized waves, respectively. The proposed structure can transmit a nearly pure circularly polarized wave, with a polarization extinction ratio of greater than 30 dB. Moreover, the metasurface is compact with simple geometry, which is not only extremely thin in the propagating direction but also very small in the transverse direction. The retrieval results reveal that the effective refractive index of the e-shape structure is nearly negative in the vicinity of resonant frequencies. The surface current distributions are investigated to illustrate the polarization transformation mechanism. We also analyze the influence of several main geometric parameters for regulating the polarization properties. The proposed e-shape structure is promising for use in the design of polarization control devices. (C) 2016 Elsevier B.V. All rights reserved.