A dynamically tunable terahertz perfect absorber based on surface patterned graphene nanofilm

IF 2.3 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Can Gu , Huijuan Niu , Yuxin Zhu , Limei Qi , Hefu Li , Chenglin Bai
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引用次数: 0

Abstract

This article propounds a wideband, multi-peak and tunable terahertz (THz) absorber composed of symmetrically patterned graphene-dielectric-metal (SPG-d-M) structures. The findings from the show that the absorptivity of the proposed SPG-d-M structure at 2.33 to 6.10 THz exceeds 90 % when the Fermi level Ef = 1.05 eV. Furthermore, by modulating the external bias voltage applied to graphene, it is possible to modify its Fermi level from 0 eV to 1.25 eV, resulting in a change in absorptivity from 9.86 % to nearly complete absorption. The comparison of various top-layer graphene patterns demonstrates the superiority of our proposed SPG. We elucidate the physical mechanism of wide-band absorption by analyzing the field distribution of the structure at various peak frequencies. The SPG-d-M absorber achieves polarization angle insensitivity, and the absorption efficacy is maintained even at oblique angles of incidence. Consequently, the absorber demonstrates considerable potential for applications in the domains of medical imaging and stealth technology.
基于表面图像化石墨烯纳米膜的动态可调谐太赫兹完美吸收体
本文提出了一种由对称图型石墨烯-介电-金属(SPG-d-M)结构组成的宽带、多峰、可调谐太赫兹(THz)吸收体。结果表明,当费米能级Ef = 1.05 eV时,SPG-d-M结构在2.33 ~ 6.10 THz范围内的吸收率超过90%。此外,通过调制施加在石墨烯上的外部偏置电压,可以将其费米能级从0 eV修改到1.25 eV,从而使吸收率从9.86%变化到几乎完全吸收。各种顶层石墨烯模式的比较证明了我们所提出的SPG的优越性。通过分析该结构在不同峰频处的场分布,阐明了宽带吸收的物理机理。SPG-d-M吸收器实现了极化角不敏感,即使在斜入射角下也能保持吸收效果。因此,吸收剂在医学成像和隐身技术领域的应用显示出相当大的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physics Letters A
Physics Letters A 物理-物理:综合
CiteScore
5.10
自引率
3.80%
发文量
493
审稿时长
30 days
期刊介绍: Physics Letters A offers an exciting publication outlet for novel and frontier physics. It encourages the submission of new research on: condensed matter physics, theoretical physics, nonlinear science, statistical physics, mathematical and computational physics, general and cross-disciplinary physics (including foundations), atomic, molecular and cluster physics, plasma and fluid physics, optical physics, biological physics and nanoscience. No articles on High Energy and Nuclear Physics are published in Physics Letters A. The journal''s high standard and wide dissemination ensures a broad readership amongst the physics community. Rapid publication times and flexible length restrictions give Physics Letters A the edge over other journals in the field.
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