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Designing dual-band absorbers by graphene/metallic metasurfaces
Barzegar Parizi, S ; Sharif University of Technology | 2019
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- Type of Document: Article
- DOI: 10.1109/JQE.2019.2901992
- Publisher: Institute of Electrical and Electronics Engineers Inc , 2019
- Abstract:
- This paper presents a novel approach for designing dual-band absorbers based on graphene and metallic metasurfaces for terahertz and mid-infrared regimes, respectively. The absorbers are composed of a 2D array of square patches deposited on a dielectric film terminated by a metal plate. Using an analytical circuit model, we obtain closed-form relations for different parameters of the structure to achieve the dual-band absorber. Two absorption bands with an obtained absorptivity of 98% at 0.53 and 1.53 THz for the graphene-based structure and 7 and 25 THz for the metallic-based case are achieved. We demonstrate that the graphene-based absorber remains as the dual band for a wide range of the Fermi level. Furthermore, the recommended dual-band absorbers are insensitive in terms of polarization and remain within various incident angles. The most important advantage of this device is its simplicity compared with the previously reported structures
- Keywords:
- Absorber ; Circuit model ; Dual band ; Mid-infrared ; Patch array ; THz frequencies ; Circuit simulation ; Dielectric films ; Infrared devices ; Plate metal ; Circuit modeling ; Midinfrared ; Patch arrays ; THz frequencies ; Graphene
- Source: IEEE Journal of Quantum Electronics ; Volume 55, Issue 2 , 2019 ; 00189197 (ISSN)
- URL: https://ieeexplore.ieee.org/document/8653895