Liu Jing, Chen Wei, Zheng Jia-Chun, Chen Yu-Shan, Yang Cheng-Fu
School of Information Engineering, Jimei University, Xiamen 361021, China.
Navigation Institute, Jimei University, Xiamen 361021, China.
Nanomaterials (Basel). 2019 Dec 20;10(1):27. doi: 10.3390/nano10010027.
We theoretically proposed and numerically analyzed a polarization-independent, wide-angle, and ultra-broadband absorber based on a multi-layer metasurface. The numerical simulation results showed that the average absorption rates were more than 97.2% covering the broad wavelength of 400~6000 nm (from visible light to mid-infrared light) and an absorption peak was 99.99%, whatever the polarization angle was changed from 0° to 90°. Also, as the incidence angle was swept from 0° to 55°, the absorption performance had no apparent change over the wavelength ranges of 400 to 6000 nm. We proved that the proposed metasurface structure was obviously advantageous to achieve impedance matching between the absorber and the free space as compared with conventionally continuous planar-film structures. The broadband and high absorption resulted from the strong localized surface plasmon resonance and superposition of resonant frequencies. As expectable the proposed absorber structure will hold great potential in plasmonic light harvesting, photodetector applications, thermal emitters and infrared cloaking.
我们从理论上提出并对基于多层超表面的偏振无关、广角且超宽带吸收器进行了数值分析。数值模拟结果表明，无论偏振角从0°变化到90°，在400~6000 nm（从可见光到中红外光）的宽波长范围内平均吸收率均超过97.2%，且吸收峰值为99.99%。此外，当入射角从0°扫描到55°时，在400至6000 nm波长范围内吸收性能无明显变化。我们证明，与传统的连续平面薄膜结构相比，所提出的超表面结构在实现吸收器与自由空间之间的阻抗匹配方面具有明显优势。宽带和高吸收是由强烈的局域表面等离子体共振和共振频率的叠加导致的。正如预期的那样，所提出的吸收器结构在等离子体光捕获、光电探测器应用、热发射器和红外隐身方面将具有巨大潜力。
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