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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Graphene-based single-layer elliptical pattern metamaterial absorber for adjustable broadband absorption in terahertz range
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Graphene-based single-layer elliptical pattern metamaterial absorber for adjustable broadband absorption in terahertz range

机译:基于石墨烯的单层椭圆图案超材料吸收器,用于太赫兹范围内可调宽带吸收

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摘要

Graphene can be utilized in designing adjustable terahertz (THz) devices due to its variability of sheet conductivity. In this paper, a broadband adjustable graphene absorber operating at THz frequencies is proposed. By changing the Fermi level of the graphene from 0 eV-1 eV, the absorption relative bandwidth and absorption rate can be adjusted from 20%-90.32% and from 0-100%, respectively. The Fermi level of the graphene can be adjusted actively by adjusting the bias voltage on the graphene layer or by chemical doping, which enables us to electrically or chemically control the absorption performance flexibly. We use the multi-reflection interference theory to investigate the physical insight of the proposed absorber under normal incidence and oblique incidence. This paper is the first to interpret oblique incidence using the multi-reflection interference theory. From this, we can infer the value of effective permittivity of the absorber under oblique incidence, which provides great help for the design of an absorber. The calculated and simulated results are in excellent agreement.
机译:由于其片状导电性的可变性,石墨烯可以用于设计可调节的太赫兹(THz)器件。在本文中,提出了在THz频率下操作的宽带可调石墨烯吸收器。通过从0 EV-1 EV改变石墨烯的费米水平,可以分别从20%-90.32%和0-100%调节吸收相对带宽和吸收率。通过调节石墨烯层上的偏置电压或通过化学掺杂可以主动地调节石墨烯的费米水平,这使得我们能够灵活地电气或化学控制吸收性能。我们使用多反射干扰理论来调查正常发病率和倾斜发病率下建议吸收器的物理洞察力。本文是第一个解释使用多反射干扰理论的斜发射。由此,我们可以在斜发射下推断吸收器的有效介电常数,为吸收器的设计提供了很大的帮助。计算的和模拟结果非常一致。

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