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Design of a wideband terahertz metamaterial absorber based on Pythagorean-tree fractal geometry
Optical Materials Express ( IF 2.8 ) Pub Date : 2020-11-02 , DOI: 10.1364/ome.409677
R. M. H. Bilal , M. A. Naveed , M. A. Baqir , M. M. Ali , A. A. Rahim

Broadband absorption in the terahertz regime is a challenge and onerous to realize with a single layer metasurface. Self-similarity in fractal structures are exploiting metamaterial characteristics that offer a promising platform to design wideband microwave and optical devices. This paper presents a metamaterial absorber that consists of fractal geometry of Pythagorean-tree. The proposed metamaterial absorber demonstrates the wideband absorptivity in a terahertz spectrum ranging from 7.5–10 THz. Both transverse electric (TE)–and transverse magnetic(TM)–mode are taken up under different obliquity incidence angles to deeply study the angular dependence on absorption features of the Pythagorean-tree fractal meta-absorber (PTFMA). A numerical approach of interference theory is employed to verify the simulation results of the designed PTFMA. Further, the performance of the PTFMA was analyzed in terms of the figure of merit (FOM) and operational bandwidth (OBW) for different geometric parameters. Furthermore, surface electric field patterns and current distributions were studied to understand the absorption mechanism of the suggested PTFMA. The designed absorber would be a promising contender for bolometers, THz detection, and communication.

中文翻译:

基于勾股树分形几何的宽带太赫兹超材料吸收体设计

太赫兹范围内的宽带吸收是一个挑战,而且很难用单层超表面来实现。分形结构中的自相似性正在利用超材料特性,为设计宽带微波和光学设备提供了一个有前途的平台。本文提出了一种由勾股树的分形几何组成的超材料吸收器。所提出的超材料吸收器在 7.5-10 THz 的太赫兹光谱中展示了宽带吸收率。在不同的倾斜入射角下采用横向电(TE)和横向磁(TM)模式,以深入研究勾股树分形元吸收器(PTFMA)的吸收特性的角度依赖性。采用干涉理论的数值方法来验证设计的 PTFMA 的仿真结果。更多,根据不同几何参数的品质因数 (FOM) 和操作带宽 (OBW),对 PTFMA 的性能进行了分析。此外,研究了表面电场模式和电流分布,以了解建议的 PTFMA 的吸收机制。设计的吸收器将成为辐射热计、太赫兹检测和通信的有力竞争者。
更新日期:2020-11-02
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