This study presents a new dual-band terahertz absorber (DBTA) with ease of production consisting of a metallic base plane of a certain thickness, a dielectric layer on this plane, and a hexagonal metallic metasurface structure. The proposed absorber exhibits absorption band peaks above 99% at two distinct frequencies (7.51 and 8.08 THz). The absorption origin is explained as a dual-band response using the LC resonance and dipolar response. In this way, the presented absorber facilitates production by improving absorption responses with a much simpler structure, unlike studies with complex geometries. The proposed dual-band absorber results in sensitivity to the polarization of the incident light. Thus, it also makes the proposed structure very helpful for manipulating wave polarization and detecting waves with particular polarization. The hexagonal structure of the absorber is scaled to millimeter dimensions, and its transformation into another dual-band absorber that can also operate in microwave frequency regions. Similarly, the hexagonal structure is transformed into a circular structure with the same geometric dimensions, and a different dual-band absorber is obtained in the terahertz (THz) region. Moreover, the proposed concept can be extended for various applications such as bolometric sensing, thermal imaging, energy harvesting, sensing, and selective thermal emitters.

中文翻译：

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基于LC谐振和偶极响应的双波段太赫兹超材料吸收体及其应用

本研究提出了一种易于生产的新型双波段太赫兹吸收体（DBTA），由一定厚度的金属基面、该平面上的介电层和六边形金属超表面结构组成。所提出的吸收体在两个不同频率（7.51 和 8.08 THz）处表现出超过 99% 的吸收带峰值。吸收起源被解释为使用 LC 共振和偶极响应的双带响应。通过这种方式，所提出的吸收器通过以更简单的结构改善吸收响应来促进生产，这与复杂几何形状的研究不同。所提出的双波段吸收器导致对入射光的偏振敏感。因此，它也使得所提出的结构对于操纵波偏振和检测具有特定偏振的波非常有帮助。吸收体的六边形结构被缩小到毫米尺寸，并且转变为另一种也可以在微波频率区域工作的双波段吸收体。类似地，将六边形结构转化为具有相同几何尺寸的圆形结构，在太赫兹（THz）区域获得不同的双波段吸收体。此外，所提出的概念可以扩展到各种应用，例如辐射热传感、热成像、能量收集、传感和选择性热发射器。