Zhonglei Shen, Shengnan Li, Yafei Xu, Wei Yin, Liuyang Zhang, Xuefeng Chen,
https://journals.aps.org/prapplied/accepted/8a07fA2eR92Eb21fc0543747f93354de88f756bd6
Terahertz (THz) absorbers have recently attracted extensive attention by their promising potential in various applications, however, many existing THz absorbers are restrained by their narrow bandwidth, complicate and costly fabrication process that render them unfavorable for practical devices. Herein, we have proposed a stereoscopic multilayered ultra-broadband THz metamaterial absorber by stacking multilayer concentric resonators on the different-level top surfaces of a monolithic 3D pagoda-like substrate. By taking full advantage of 3D printing technique, the proposed ultra-broadband absorber can be produced efficiently by easy-going three-step process that overcomes the fabrication complexities of traditional multistep photolithography processes. Additionally, the feasibility and robustness of the proposed fabrication method for common out-of-plane THz narrowband absorbers have also been validated, and the absorption capacities of the 3D printed absorbers have been numerically and experimentally elucidated. These results might provide novel concept and fabrication technique to stimulate many potential applications in emerging THz technologies, such as sensing, imaging and wireless communications.
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