3D Nickel Skeletons as Ultrabroadband Terahertz Absorbers

Abstract

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.

Polymeric Fe3O4 Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding

“…This SE value of samples is comparable and even much better than the shielding performance of other composite materials at this low thickness value. Table S2, in Supporting Information, represents the comparison of recently published literature with the results of this study, which gives clear view of the potential of these samples. − …”

Microwave-assisted ZnO-decorated carbon urchin resembling ‘shish-kebab’ morphology with self-healing and enhanced electromagnetic shielding properties

“…Owing to the surprising rapid growth in the electronic and telecommunication industries, the demand for lightweight and thermally stable electromagnetic interference (EMI) shields has massively increased. [1][2][3][4][5][6][7][8][9][10] However, the high density of miniaturized devices in these sectors is generating serious electromagnetic (EM) radiation and deteriorating the smooth functioning of devices. 1,[11][12][13] These harmful radiations have become challenging for human health.…”

Design of ultra-thin multi-band sub-terahertz metamaterial absorber using three concentric ring resonators with same opening direction

“…Due to the remarkable advances in terahertz technology in recent years, its high penetration, low energy and high sensitivity have enabled it to have a wide range of applications in wireless communication [3][4][5], biomedicine [6][7][8], non-destructive testing and other fields [9][10][11]. To facilitate the growth of terahertz technology, a multitude of functional devices relevant to its applications have been proposed, such as polarization converters [12,13], detectors [14,15], absorbers [16,17], etc. However, terahertz waves interact weakly with natural materials, and metamaterials [18,19] can compensate for this.…”