Xie Jianwen, Zhu Weiren, Rukhlenko Ivan D, Xiao Fajun, He Chong, Geng Junping, Liang Xianling, Jin Ronghong, Premaratne Malin
Opt Express. 2018 Feb 19;26(4):5052-5059. doi: 10.1364/OE.26.005052.
A subwavelength water metamaterial is proposed and analyzed for ultra-broadband perfect absorption at microwave frequencies. We experimentally demonstrate that this metamaterial shows over 90% absorption within almost the entire frequency band of 12-29.6 GHz. It is also shown that the proposed metamaterial exhibits a good thermal stability with its absorption performance almost unchanged for the temperature range from 0 to 100°C. The study of the angular tolerance of the metamaterial absorber shows its ability of working at wide angles of incidence. Given that the proposed water metamaterial absorber is low-cost and easy for manufacture, we envision it may find numerous applications in electromagnetics such as broadband scattering reduction and electromagnetic energy harvesting.
本文提出了一种亚波长水超材料，并对其在微波频率下的超宽带完美吸收特性进行了分析。我们通过实验证明，这种超材料在12 - 29.6 GHz的几乎整个频带内吸收率超过90%。研究还表明，所提出的超材料具有良好的热稳定性，在0至100°C的温度范围内，其吸收性能几乎不变。对超材料吸收体角度容差的研究表明，它能够在宽入射角下工作。鉴于所提出的水超材料吸收体成本低且易于制造，我们预计它可能在电磁学领域有众多应用，如宽带散射减少和电磁能量收集。
