Bandwidth broadening of a linear polarization converter by near-field metasurface coupling.

Bandwidth broadening of a linear polarization converter by near-field metasurface coupling.
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通过近场超表面耦合拓宽线性偏振转换器的带宽

DOI:
10.1038/s41598-017-07296-4
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发表时间:
2017-07-28
期刊:
影响因子:
4.6
通讯作者:
Zhang W
Zhang W
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gao X;Singh L;Yang W;Zheng J;Li H;Zhang W

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我们实验证明了一个高效的,宽带线性偏振转换器工作在太赫兹频率。线性极化变换器由三个超表面和两个相互交错的介电层组成。线性极化变换器中心超表面层相邻的单元胞表现出强烈的电磁耦合,这增加了共振次数,导致带宽显着拓宽。仿真和实验结果表明,在0.2 ~ 0.4 THz的频率范围内,所设计的偏振变换器具有平坦的传输曲线,传输效率高于80%。高性能的太赫兹偏振转换在许多领域都是需要的,如太赫兹光谱学、成像和通信。
We experimentally demonstrate a highly efficient, broadband linear polarization converter functioning at terahertz frequencies. The linear polarization converter is composed of three metasurfaces and two dielectric layers interlaced with each other. The neighboring unit cells of the central metasurface layer of the linear polarization converter exhibit strong electromagnetic coupling, which increases the number of resonances and results in significant bandwidth broadening. The simulation and experimental results show that in the frequency range of 0.2 to 0.4 THz, the proposed polarization converter has a flat transmission curve and exhibits a transmission efficiency that is higher than 80%. High performance terahertz polarization conversion is desirable in many fields, such as terahertz spectroscopy, imaging, and communications.
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