2019/02/14 by Omid Mohsen Daraei, Daraei, Omid Mohsen, Mohammad Eskandari +7
Engineering · Materials Science · Physics and Astronomy · #Advanced Antenna and Metasurface Technologies #Applied Physics (physics.app-ph) #FOS: Physical sciences #Metamaterials and Metasurfaces Applications #Optics (physics.optics) #Terahertz technology and applications #physics.app-ph #physics.optics
paper · pdf · doi:10.48550/arxiv.1902.05254
openalex publication_date 2019/02/14 · arxiv created 2020/12/18 · arxiv updated 2020/12/21 · openalex created_date 2021/01/05 · openalex updated_date 2026/07/28
In this paper, we analytically design a simple configuration of a broadband THz and polarization-insensitive absorber. The mentioned absorber consists of two layers of graphene disks, and the transmission line model is considered for the whole of the proposed absorber's structure to design it accurately. Therefore, the input admittance of the designed absorber is obtained by the transmission line model. Also, the real part of the input admittance is approximately tuned to be matched to the free space admittance. In contrast, the imaginary part of it is closely adjusted to zero around the central frequency of the THz absorber. Using only just two layers of Periodic Arrays of Graphene Disks (PAGDs) with one kind of dielectric as the material of substrates, it causes that the absorption of the structure can be achieved higher than 90% by the Finite Element Method (FEM). Normalized bandwidth has reached up to 75.4% in 5 THz as the central frequency of the device. As the next step, we use the CST studio software to validate our designed absorber, and it will show that the numerical results will have the best matching with the analytical method.