Graphene-based metamaterial ultrawideband absorber with enhanced terahertz performance

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2024-09-10 DOI:10.1016/j.rinp.2024.107965

Abbas Movahednia , V. Mashayekhi , Ehsan Zareian-Jahromi , Seyed Mohamad Hashemi

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Abstract

In this paper, we present a graphene-based metamaterial ultrawideband absorber operating in the terahertz regime. The absorber is composed of two patterned and continuous graphene layers, a bottom gold layer, and a SiO₂ substrate that separates the continuous graphene layer from the gold layer. The absorption spectrum is enhanced by integrating a graphene resonator with water, which has frequency-dependent permittivity. The water is encapsulated in polytetrafluoroethylene (PTFE) in the form of a circular ring sandwiched between the two graphene layers. Simulation results show that the absorber attains a 90 % absorption bandwidth of about 14.55 THz. The proposed absorber is polarization-insensitive under normal incidence. For TE polarization, the absorption level remains stable for incident angles θ from 0° to 55° across the entire frequency band (14.55 THz), except for the 5–8 THz range. For TM polarization, the absorption level remains stable for θ ranging from 0° to 60° over the entire bandwidth. Additionally, the absorption level is consistent for both TM and TE polarizations across the entire bandwidth for incident angles φ from 0° to 90°.

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具有更强太赫兹性能的石墨烯基超材料超宽带吸收器

本文介绍了一种基于石墨烯的超材料超宽带吸收器，可在太赫兹范围内工作。该吸收器由两个图案化的连续石墨烯层、一个底部金层和一个将连续石墨烯层与金层隔开的二氧化硅基底组成。通过在石墨烯谐振器中加入水（水的介电常数随频率变化），增强了吸收光谱。水被封装在聚四氟乙烯（PTFE）中，呈圆环状夹在两个石墨烯层之间。模拟结果表明，该吸收器的吸收带宽达到 90%，约为 14.55 太赫兹。在正常入射情况下，所提出的吸收器对偏振不敏感。对于 TE 极化，在整个频段（14.55 太赫兹）内，入射角 θ 从 0° 到 55°，吸收水平保持稳定，5-8 太赫兹范围除外。对于 TM 极化，在整个带宽范围内，入射角 θ 从 0° 到 60° 时，吸收水平保持稳定。此外，在入射角 φ 为 0° 至 90° 的整个带宽范围内，TM 和 TE 极化的吸收水平也是一致的。

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

期刊介绍： Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.