An ultra-thin, multiband, micro-slot based metamaterial absorber is presented in this paper. The proposed unit cell is compact which is in the form of single-layer gold patch-gallium arsenide-ground package, involving four identical micro-slots. Using the micro-slots, the fundamental circular patch gains a multiband resonation skill, and the absorber operates at 1.16, 2.73, and 4.57 THz bands with near-perfect absorptivity. The absorption mechanism is discussed based on the electric and surface current distributions, and all outcomes are also validated by the effective medium approach. The proposed absorber is ultra-thin with a thickness of 2.6 µm, corresponding to ∼λ/100 at its lowest operation frequency. The unit cell indicates polarization-independent, and wide incident angle absorption spectra up to 40°, hence, the proposed absorber is a promising candidate as an absorbing platform for THz band imaging and sensing applications.

中文翻译：

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基于超薄、多波段、微槽的太赫兹超材料吸收体的设计

本文介绍了一种基于超薄、多波段、微缝隙的超材料吸收器。所提出的单元电池是紧凑的，采用单层金贴片 - 砷化镓 - 接地封装的形式，涉及四个相同的微槽。使用微槽，基本圆形贴片获得了多波段谐振技能，吸收器在 1.16、2.73 和 4.57 THz 波段工作，具有近乎完美的吸收率。基于电流和表面电流分布讨论吸收机制，所有结果也通过有效介质方法验证。所提出的吸收器是超薄的，厚度为 2.6 µm，对应于其最低工作频率下的~λ/100。晶胞显示与偏振无关的宽入射角吸收光谱，最高可达 40°，因此，