Ultrathin broadband terahertz metamaterial based on single-layer nested patterned graphene

Here we design a graphene-based polarization-insensitive, novel tunable broadband metamaterial absorber. The overall structure of the absorber is patterned graphene-dielectric layer- metal layer. We use localized surface plasmon resonance (LSPR), impedance matching and other theories to analyze its physical mechanism in detail. Then based on the finite element method (FEM), we used the simulation software CST STUDIO SUITE to simulate the absorbing characteristics of the designed absorber to obtain the spectral performance in the 0-10 THz band. In addition, the resonant frequency of the absorber can be changed by adjusting the Fermi level of graphene, when the Fermi level E-f = 1.2 eV, the absorber has a broadband absorption effect, covering the 3.8 similar to 7.19 THz band, and the absorption rate is above 90 %. Furthermore, the absorber exhibits independence from changes in polarization angle due to the overall symmetry. In fields such as stealth, filtering, spectral detection, terahertz imaging, etc., this technology has potential application prospects.