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Quad-band polarization-insensitive metamaterial perfect absorber based on bilayer graphene metasurface
Physica E: Low-dimensional Systems and Nanostructures ( IF 3.3 ) Pub Date : 2021-01-07 , DOI: 10.1016/j.physe.2021.114621
Pouria Zamzam , Pejman Rezaei , Seyed Amin Khatami

In this paper a quad-band, polarization-insensitive metamaterial perfect absorber (MPA) based on bi-layer graphene in the terahertz regime is presented. Initially, four models of the desired structure by using a single-layer graphene metasurface were examined. The results of the proposed four models show that two absorption peaks were finally achieved at frequencies of 3.19 THz and 4.66 THz with the absorption of 99.61% and 99.95%, respectively. Then, by stacking the double layer graphene metasurface, a quad-band perfect absorber with an average absorption of 99.43% at the frequencies of 2.7 THz, 3.19 THz, 3.99 THz and 4.46 THz is obtained for 0.9 eV Fermi energy. Also, physical mechanisms of MPA have been studied by impedance matching theory. The study of the proposed structure with graphene metasurface has the advantage that the resonant frequency can be tunably adjusted without manufacturing again of the proposed structure. Furthermore, the proposed perfect absorber of metamaterial is polarization-insensitive and is more tolerant than the incident angle. The proposed absorber in this paper has potential in filtering, detection, imaging and other applications photodetectors, and other applications.



中文翻译:

基于双层石墨烯超表面的四波段极化不敏感超材料完美吸收体

本文提出了一种基于双层石墨烯的太赫兹结构的四波段,对极化不敏感的超材料完美吸收体(MPA)。最初,通过使用单层石墨烯超表面对所需结构的四个模型进行了研究。所提出的四个模型的结果表明,在3.19 THz和4.66 THz的频率下最终获得了两个吸收峰,吸收分别为99.61%和99.95%。然后,通过堆叠双层石墨烯超表面,对于0.9 eV费米能量,获得在2.7 THz,3.19 THz,3.99 THz和4.46 THz频率下平均吸收率为99.43%的四频完美吸收体。另外,已经通过阻抗匹配理论研究了MPA的物理机制。对所提出的具有石墨烯超表面的结构的研究具有的优点是,可以在不再次制造所提出的结构的情况下,可调谐地调节谐振频率。此外,提出的超材料的完美吸收体是偏振不敏感的,并且比入射角更宽容。本文提出的吸收体在过滤,检测,成像和其他应用中具有潜力,在光电探测器和其他应用中也是如此。

更新日期:2021-01-16
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