Perfect double-layer terahertz absorber based on graphene metamaterial

Using bilayer graphene structures (L-type and disk-type structures), we numerically demonstrate a tunable single-band terahertz metamaterial absorber with nearly perfect (100%) absorption by continuously adjusting the graphene Fermi energy parameters to determine the maximum absorption rate, the corresponding center frequency, and bandwidth. Graphene distinct dielectric-metal transition properties make it possible to achieve tunable terahertz absorption. The maximum absorption rate increases from 18% to 100% when the Fermi energy is increased from 0.1 to 1 eV. At 1 eV, the absorption rate exceeds 90% in the range of 0.57-1.03 THz. The incident angle is also tested. When the angle is in the range of 60 & DEG;, excellent adsorption performance is maintained. (c) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)

Automated summary

By adjusting the graphene Fermi energy parameters, a tunable terahertz metamaterial absorber with nearly perfect absorption (100%) can be achieved. The distinct properties of graphene enable tunable terahertz absorption, and excellent absorption performance is maintained within a certain range of incident angles.