Abstract
A graphene-based controllable broadband terahertz metamaterial absorber with transmission band is presented in this paper. It consists of a graphene-SiO2-frequency selective surface (FSS) sandwich structure. The sinusoidal graphene layer supports continuous plasmonic resonances, forming a broad electric-tuning absorbing band. Bandpass FSS constructs a transmission window outside the absorbing band. The simulation results indicate that the absorption from 0.5 THz to 1 THz can be tuned continuously from 0.4 to 0.9 with angle and polarization independence. A transparent window peaking at 1.65 THz maintains high transmittance over 0.7. The metamaterial absorber has potential applications for detection, stealth, filtering, and electromagnetic compatibility.
Highlights
Terahertz (THz) absorbers have aroused the interest of more and more researchers due to potential applications for detection, sensing, trapping, communication, and stealth [1,2,3,4,5]
We demonstrate a tunable broadband metamaterial absorber with a transmission window, which is constituted by a sinusoidal graphene layer and a gold frequency selective surface (FSS) separated by a
The angle-independent broadband absorption is formed by continuous plasmonic resonances supported by the gradient widths, and the same period in both x and y directions ensures the polarization independence
Summary
Terahertz (THz) absorbers have aroused the interest of more and more researchers due to potential applications for detection, sensing, trapping, communication, and stealth [1,2,3,4,5]. Owing to the unique properties, including excellent mechanical properties, the capacity to support surface plasmon polaritons (SPPs), and the tunability of its carrier mobility and conductivity, graphene is one of the promising materials for designing tunable absorbers in THz region [7,8,9,10]. Since the absorption of single undoped graphene is just close to 2.3%, a great many of THz metamaterial absorbers (TMAs) based on patterned graphene have been put forward to improve the absorption intensity, such as nanodisks, microribbons, fishnet and so on [11,12,13]
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