Tunable polarization-independent and angle-insensitive broadband terahertz absorber with graphene metamaterials

In this paper, we design a polarization-independent and angle-insensitive broadband THz graphene metamaterial absorber based on the surface plasmon-polaritons resonance. Full-wave simulation is conducted, and the results show that the designed metamaterial absorber has an absorption above 99% in the frequency range from 1.23 THz to 1.68 THz, which refers to a very high standard. Furthermore, the absorber has the properties of tunability, and the absorption can be nearly adjusted from 1% to 99% by varying the Fermi energy level of the graphene from 0 eV to 0.7 eV. In the simulation, when the incident angles of TE and TM waves change from 0 degrees to 60 degrees, the average absorption keeps greater than 80%. The proposed absorber shows promising performance, which has potential applications in developing graphene-based terahertz energy harvesting and thermal emission. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

This paper presents a novel graphene metamaterial absorber with polarization-independent and angle-insensitive properties in the THz frequency range. It achieves absorption above 99% and tunability from 1% to 99% by adjusting the Fermi energy level of graphene. The absorber maintains an average absorption greater than 80% when incident angles vary from 0 to 60 degrees, showing promising performance for potential applications in THz energy harvesting and thermal emission.