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Numerical Study of an Ultra-Broadband and Polarization Independence Metamaterial Cross-Shaped Fractal Absorber
Plasmonics ( IF 3.3 ) Pub Date : 2020-04-29 , DOI: 10.1007/s11468-020-01156-0
Juefu Liu , Jiao Chen , Huan Liu , Yuanyuan Liu , Lu Zhu

A three-dimensional cross-shaped fractal metamaterial absorber with ultra-wide wavelength band, polarization-independence and wide-angle, is numerically investigated by the finite-difference time-domain method. In this absorber, the solar energy is trapped by the cross-shaped fractal of the upper layer, and the Si-ring filled with iron in the middle layer and the wavelength band can be broadened by the self-similarity of fractal structure. The absorber exhibits absorptivity higher than 91% for the wavelengths from 400 to 2000 nm and an absorption bandwidth of about 133%. Furthermore, the proposed absorber realizes polarization independence, and the maximum incident angle is 76°. However, as the iron material applied in the nano-metamaterial absorber (NMA) can be easily oxidized and rusted, it is replaced by nickel with characteristics such as corrosion resistance and high-temperature resistance; thus, an improved NMA is obtained. The improved absorber not only eliminates the corrosion-prone defects of the above proposed structure but also maintains polarization independence and high absorption and widens the angle of incidence up to 79° and thereby can be applied in many areas, such as solar energy harvesting.

中文翻译:

超宽带和偏振独立超材料交叉形分形吸收体的数值研究

利用时域有限差分法,对具有超宽波段,偏振无关和广角的三维十字形分形超材料吸收体进行了数值研究。在该吸收体中,太阳能被上层的十字形分形捕获,并且通过分形结构的自相似性,在中间层中填充铁的Si环和波长带可以变宽。对于400至2000nm的波长,吸收剂表现出高于91%的吸收率,并且吸收带宽约为133%。此外,所提出的吸收体实现偏振无关,并且最大入射角为76°。但是,由于应用于纳米金属吸收剂(NMA)的铁材料容易被氧化和生锈,用镍代替,具有耐腐蚀性和耐高温性。因此,获得了改进的NMA。改进的吸收器不仅消除了上述结构的易腐蚀缺陷,而且保持了偏振无关性和高吸收率,并将入射角扩大到79°,因此可用于许多领域,例如太阳能收集。
更新日期:2020-04-29
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