Metasurface Broadband Solar Absorber.
Metasurface Broadband Solar Absorber.
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DOI：
10.1038/srep20347
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发表时间：
2016-02-01
影响因子：
4.6
通讯作者：
Chen HT
中科院分区：
文献类型：
--
作者：
Azad AK;Kort-Kamp WJ;Sykora M;Weisse-Bernstein NR;Luk TS;Taylor AJ;Dalvit DA;Chen HT
我们展示了一种基于金属超表面结构的宽带，偏振无关的广角吸收器，它在太阳光谱的可见光和近红外范围内具有大于90%的吸收率，并且在中远红外波长处具有低吸收率（发射率）。超表面太阳能吸收器的复杂单元电池由八对金纳米谐振器组成，这些谐振器通过薄的二氧化硅间隔层与金接平面分开。我们的实验测量显示，在大范围的入射角内，s偏振和p偏振都具有高性能的吸收。我们还研究了频率相关的场和电流分布，以阐明吸收如何在超表面结构中发生。
We demonstrate a broadband, polarization independent, wide-angle absorber based on a metallic metasurface architecture, which accomplishes greater than 90% absorptance in the visible and near-infrared range of the solar spectrum, and exhibits low absorptivity (emissivity) at mid- and far-infrared wavelengths. The complex unit cell of the metasurface solar absorber consists of eight pairs of gold nano-resonators that are separated from a gold ground plane by a thin silicon dioxide spacer. Our experimental measurements reveal high-performance absorption over a wide range of incidence angles for both s- and p-polarizations. We also investigate numerically the frequency-dependent field and current distributions to elucidate how the absorption occurs within the metasurface structure.