ABSTRACT

In this paper, a three-dimensional (3D), ultra-broadband and polarization insensitive metamaterial absorber (MA) base on the metal loading resistive films structure was introduced. Numerical results show that ultra-wideband absorption more than 90% can be achieved from 4.8 to 14.67 THz, the relative bandwidth up to 101%. The reason of the highly efficient absorption is contributed to the metal Ohm loss and load absorption of the resistive film in the gap of metallic SRRs (split-ring resonators) mainly. Importantly, we found loading resistive film in the gap of the metal-film can significantly promote absorption. Circle currents are formed on twelve SRRS and the electromagnetic energy is collected on the resistive films. The surface currents are researched to explain the physics mechanism of the MA. Moreover, the harvesting efficiencies for energy on the normal and oblique incidences are investigated. Finally, we calculated the HPBW (Half Power Band Width) of harvesting efficiency, a characteristic with dual-band half power absorption is obtained.

摘要

在本文中，介绍了一种基于金属负载电阻膜结构的三维（3D）、超宽带和偏振不敏感超材料吸收器（MA）。数值结果表明，在4.8~14.67 THz范围内可实现90%以上的超宽带吸收，相对带宽可达101%。高效吸收的原因主要是金属SRR（裂环谐振器）间隙中电阻膜的金属欧姆损耗和负载吸收。重要的是，我们发现在金属膜间隙中加载电阻膜可以显着促进吸收。在 12 个 SRRS 上形成环形电流，电磁能被收集在电阻膜上。研究表面电流以解释 MA 的物理机制。而且，研究了垂直入射和斜入射的能量收集效率。最后，我们计算了收获效率的HPBW（Half Power Band Width），得到了具有双波段半功率吸收的特性。