Graphene-based terahertz metamaterial absorber for broadband applications

被引：19

作者：

Ahmadi, Hanieh ^{[1
]}

Vaezi, Sedigheh ^{[2
]}

Harzand, Vahid Jafarzadeh ^{[3
]}

Safian, Reza ^{[4
]}

机构：

[1] Islamic Azad Univ, South Tehran Branch, Dept Elect Engn, Tehran, Iran

[2] Islamic Azad Univ, Mashhad Branch, Dept Elect Engn, Mashhad, Razavi Khorasan, Iran

[3] Univ Bologna, Dept Elect Elect & Informat Engn, Bologna, Italy

[4] Isfahan Univ Technol, Dept Elect & Comp Engn, Esfahan, Iran

来源：

SOLID STATE COMMUNICATIONS | 2021年 / 323卷

关键词：

Graphene absorber; Terahertz structure; Broadband; Coupled waves; CIRCUIT MODEL; WIDE-BAND; DESIGN; MULTIBAND; SHEET; DISKS;

D O I：

10.1016/j.ssc.2020.114023

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Terahertz (THz) metamaterial absorbers are promised as one of the appropriate candidates for the biosensing and imaging novel devices. In this work, a wideband THz absorber consists of two periodic arrays of graphene ribbons (PAGRs) and one graphene continuous sheet (GCS) in a form of Fabry-Perot resonator is presented. Analytical circuit model of PAGRs and GCS in addition to a developed transmission line theory is exploited to model the proposed structure as RLC circuits. The concept of impedance matching with the aid of circuit principles besides a genetic algorithm (GA) are implemented to reduce the reflected waves from the structure. As a result, a THz absorber with absorption over 98% in the frequency range of 6.45-7.35 THz is achieved. The use of GCS as a coupling element to boost the absorption bandwidth is investigated. The results of this work is in a high demand for the THz sensing and imaging applications and it can be fabricated through chemical vapor deposition (CVD).

引用

页数：7

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