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Numerical Study of an Ultra-Broadband and Polarization Independence Metamaterial Cross-Shaped Fractal Absorber

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Abstract

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.

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Funding

This research was funded by the National Nature Science Foundation of China Grant Nos. 61967007 and 61963016, the Outstanding Youth Talent Project of Jiangxi Provincial Grant No. 20171BCB23062, and the Jiangxi Provincial Department of Education Science and Technology Research Key Grant No. GJJ170360.

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Authors and Affiliations

  1. College of Information Engineering, East China Jiaotong University, Nanchang, 330013, China

    Juefu Liu, Jiao Chen, Huan Liu, Yuanyuan Liu & Lu Zhu

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  1. Juefu Liu
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  2. Jiao Chen
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  3. Huan Liu
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  4. Yuanyuan Liu
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  5. Lu Zhu
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Correspondence to Jiao Chen.

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Liu, J., Chen, J., Liu, H. et al. Numerical Study of an Ultra-Broadband and Polarization Independence Metamaterial Cross-Shaped Fractal Absorber. Plasmonics 15, 1517–1524 (2020). https://doi.org/10.1007/s11468-020-01156-0

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  • DOI: https://doi.org/10.1007/s11468-020-01156-0

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