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Water occurring on earth has always been equipped with the characteristic of frequency dispersive permittivity at microwave frequency, which thus can be seen as a promising constituent material for broadband electromagnetic wave absorption. Here, we develop water as ultrathin dielectric substrate standing on the metal backplane to construct three-dimensional grid array, which can acquire broadband...
This paper presents a design of broadband metamaterial absorbers based on spatially dispersive split ring resonators (SRRs). Because of negative permeability of SRRs, magnetic surface plasmons (SPs) are realized based on SRRs for s-polarized waves. And then, by spatially dispersion engineering, a serially structure of SRRs with heights variation is designed to realize a broadband absorber. The simulation...
In this paper, an ultra-broadband polarization-insensitive far-infrared metamterial absorber with gold nanowire is proposed. Unlike some traditional metamaterial absorbers consisting of multilayer structure, our design is made up of gold nanowire array which is much simpler. Height and permittivity constant gradient both contribute to the broadband absorption. Each single gold nanowire acts as a nano-resonator,...
We demonstrated that the three-dimensional metamaterial absorbers, consisting of the resistive patches and metallic backboard, can exhibit ultra-broadband and highly efficient absorption for a certain larger incidence of the transverse magnetic wave. The three-dimensional unit cell is constructed by bending the resistive patches, which is arranged at a certain period on the metal plate. Comparing...
Ultra-broadband absorption has always been the pursuit of the goal in the field of metamaterial absorbers(MAs). While the only requirement for the absorption bandwidth is not integrated. In this paper, we demonstrate that the directional selectivity with high-effective and broadband absorption of transverse magnetic(TM) wave can be designed by introducing a three-dimensional(3D) structure into the...
Three-dimensional structure terahertz metamaterial absorbers with the properties of ultrabroadband and polarization-insensitive absorption were proposed. Different from the recent designs of the multilayer horizontal configurations, our design consists of the uniaxial anisotropic gold nanowire arrays that are filled in the frustum pyramid dielectric medium. The principle for the ultrabroadband absorption...
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