Recent advances in terahertz (THz) absorbing materials and technology show futuristic potentials for practical applications in THz radars and telecommunications, stealth and shielding. However, the lack of versatile materials naturally working in this specific electromagnetic wave region with simultaneously featuring high absorption efficiencies, ultrabroad bandwidths, low-costs, good stabilities, and flexibilities, is impeding the proliferation of real THz disruptive applications. Here a kind of flexible structure material, 3D nickel (Ni) skeleton, fabricated from an electroplating sintering method with irregular pore distribution makes possible the successful realization of a highly absorbing response for ultrabroadband THz waves due to the effective combination of both material and structural absorption mechanisms. 3D Ni skeletons with 90 ppi nonuniform pore-size ranges enable >99% absorption capabilities in the frequency range of 0.5–2.0 THz independent on both the THz incidence angles and polarizations. Experimental validation of THz shielding implemented on both 100 GHz and 4.3 THz video imaging systems corroborates the highly efficient absorbing with frequency expansibility. Such capabilities are further verified on millimeter-wave security checkers for 32–36 GHz. This prototypical demonstration lays the foundation for the next-generation THz absorbing technology, accelerating advanced THz technologies toward practical applications.

中文翻译：

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3D 镍骨架作为超宽带太赫兹吸收器

太赫兹 (THz) 吸收材料和技术的最新进展显示了太赫兹雷达和电信、隐身和屏蔽等实际应用的未来潜力。然而，由于缺乏在这个特定电磁波区域自然工作的多功能材料，同时具有高吸收效率、超宽带宽、低成本、良好的稳定性和灵活性，这阻碍了真正的太赫兹破坏性应用的扩散。在这里，一种柔性结构材料，3D 镍 (Ni) 骨架，由具有不规则孔隙分布的电镀烧结方法制成，由于材料和结构吸收的有效结合，成功实现了对超宽带太赫兹波的高吸收响应机制。具有 90 ppi 非均匀孔径范围的 3D Ni 骨架在 0.5-2.0 THz 频率范围内具有 >99% 的吸收能力，而与太赫兹入射角和偏振无关。在 100 GHz 和 4.3 THz 视频成像系统上实施的太赫兹屏蔽的实验验证证实了高效吸收和频率可扩展性。这些功能在 32-36 GHz 的毫米波安全检查器上得到进一步验证。该原型演示为下一代太赫兹吸收技术奠定了基础，加速了先进的太赫兹技术走向实际应用。在 100 GHz 和 4.3 THz 视频成像系统上实施的太赫兹屏蔽的实验验证证实了高效吸收和频率可扩展性。这些功能在 32-36 GHz 的毫米波安全检查器上得到进一步验证。该原型演示为下一代太赫兹吸收技术奠定了基础，加速了先进的太赫兹技术走向实际应用。在 100 GHz 和 4.3 THz 视频成像系统上实施的太赫兹屏蔽的实验验证证实了高效吸收和频率可扩展性。这些功能在 32-36 GHz 的毫米波安全检查器上得到进一步验证。该原型演示为下一代太赫兹吸收技术奠定了基础，加速了先进的太赫兹技术走向实际应用。