Siyu Tan, Fengping Yan, Ningning Xu, Jingjing Zheng, Wei Wang, Weili Zhang,
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| Schematic of the proposed broadband metamaterial absorber: (a) the two interlaced square fishnet layers and the ground plane are separated by two identical polyimide spacers with the thickness h = 20 μm. (b) Microscopic graph of the fabricated sample. (c) and (d): The unit cell of the middle layer and the top layer with l = 150 μm, w1 = 35 μm and w2 = 15 μm. |
https://aip.scitation.org/doi/10.1063/1.5017099
The realization of broadband absorption in the terahertz regime is of significant interest in high-sensitive signal detection and modulation. Previously, multi-layer metamaterials have been proposed and demonstrated to expand the absorption bandwidth by clustering multiple closely-positioned structures with different absorption peaks. Here, we proposed an alternative design for broadband metamaterial absorption by incorporating two interlaced fishnet layers, and achieved a broadband absorber with a full-width at half-maximum of about 0.99 THz. We also investigated the impact of the relative position of the two fishnet layers in the form of frequency tuning and expanding the absorption band.
The realization of broadband absorption in the terahertz regime is of significant interest in high-sensitive signal detection and modulation. Previously, multi-layer metamaterials have been proposed and demonstrated to expand the absorption bandwidth by clustering multiple closely-positioned structures with different absorption peaks. Here, we proposed an alternative design for broadband metamaterial absorption by incorporating two interlaced fishnet layers, and achieved a broadband absorber with a full-width at half-maximum of about 0.99 THz. We also investigated the impact of the relative position of the two fishnet layers in the form of frequency tuning and expanding the absorption band.
