Single-Patterned Metamaterial Structure Enabling Multi-band Perfect Absorption
Single-Patterned Metamaterial Structure Enabling Multi-band Perfect Absorption
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DOI：
10.1007/s11468-016-0234-1
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发表时间：
2017-02
期刊：
影响因子：
3
通讯作者：
Ben-Xin Wang
中科院分区：
文献类型：
--
作者：
Ben-Xin Wang
基于共面超单元结构或多个垂直叠层结构的多波段或宽带理想超材料吸收体因其潜在的实际应用前景而受到广泛关注。它们的共振机理通常只利用了不同尺寸图案的基频共振的叠加，而忽略了结构的高阶共振，这使得所提出的结构制作起来相当麻烦，而目前所展示的吸波机理也缺乏新奇。本文提出了一种简单的双波段太赫兹吸收体的设计，它由一个传统的方形金属贴片和一个位于连续接地层上的介质层组成。仿真结果表明，单谐振结构有两个谐振吸收峰，平均吸收率均在99.5%以上。这种双频吸收体的机理是由于图案化结构的基模和三阶响应的叠加，这与以往报道的只将不同形状复杂结构的基模共振结合起来获得双频响应的方法完全不同。此外，所提出的单一图案化结构可以用于通过组合一个以上的共振（五阶响应）来扩展吸收峰的数量（例如，三频带吸收体）。这种结构简单的吸收体在探测、传感和选择性热辐射等领域具有潜在的应用前景。
Multi-band or broadband perfect metamaterial absorbers, based on coplanar super-unit structure or multiple vertically stacked layers, have received intense attention because of their potential for practical applications. The resonance mechanism of them usually only utilizes the overlapping of the fundamental resonance of the different-sized patterns, and neglects the high-order resonance of the structure, and thus making the proposed structures quite troublesome to be fabricated and the mechanism of the current demonstrated absorbers lack of novelty. In this paper, a simple design of dual-band terahertz absorber consisted ofonlya traditional square metallic patch and a dielectric layer on top of a continuous ground plane is presented. Simulation results show that the single resonant structure has two resonance absorption peaks, which are both average over 99.5 %. The mechanism of the dual-band absorber is due to the overlapping of the fundamental mode and three-order response of the patterned structure, which is totally different from previous reports that only combining the fundamental resonances of the different-shaped complex structures to obtain the dual-band response. Furthermore, the proposed single-patterned structure can be used to extend the number of the absorption peaks (for example, triple-band absorber) by combining one more resonance (the five-order response). The proposed absorbers with the simple structure design have potential applications in many areas, such as detection, sensing, and selective thermal emitters.