用于太赫兹间隙机制的高效微型超薄可调 UWB 石墨烯元表面吸收器

IF 2.4 4区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Current Applied Physics Pub Date : 2024-09-10 DOI:10.1016/j.cap.2024.09.004
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引用次数: 0

摘要

这项研究介绍了一种用于太赫兹(THz)间隙的超薄可调谐超宽带(UWB)元面吸收器(MSA)。这种对偏振不敏感的 MSA 在 0.1 至 11.5 太赫兹范围内的吸收率 (A(f)) ≥ 90%,相当于 196.6% 的分数带宽。顶部图案化石墨烯片(Gpat)上刻有谐振槽,顶部 Gpat 和底部连续石墨烯(Gcont)在双层堆叠配置中形成的法布里-珀罗腔内具有很强的等离子耦合,从而确保了 UWB 太赫兹频谱的吸收率。等效电路模型 (ECM) 与拟议 MSA 的 A(f) 响应密切相关。所提出的直流偏压机制可以有效调节相连 Gcont 的化学势 (μc)。0 至 6.1 V 的直流偏置电压足以使 Gcont 的 μc 在 0 至 0.6 eV 之间变化,从而实现可调的 A(f)。该结构保持了超薄特性,厚度仅为 λ0/1500,其中 λ0 是以 0.1 太赫兹计算的自由空间波长。此外,其周期性仅为 λ0/300。在横向磁(TM)和横向电(TE)极化条件下,入射角(θ)达到 60∘时,MSA 还能提供 0.1 至 11.5 THz 的稳定吸收响应,A(f) ≥ 80%。
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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An efficient and miniaturized ultra-thin tunable UWB graphene metasurface absorber for terahertz gap regime

This work introduces an ultra-thin tunable ultra-wideband (UWB) metasurface absorber (MSA) for the terahertz (THz) gap. The polarization-insensitive MSA provides an absorptivity (A(f)) ≥ 90% from 0.1 to 11.5 THz, corresponding to 196.6% fractional bandwidth. The usage of resonant slots engraved on top patterned graphene sheet (Gpat) and strong plasmonic coupling in the Fabry-Perot cavity formed between top Gpat and bottom continuous graphene (Gcont) in bilayer stack configuration ensures absorptivity over a UWB THz spectrum. An equivalent circuit model (ECM) closely follows the A(f) response of the proposed MSA. The proposed DC-biasing mechanism can regulate the chemical potential (μc) of the connected Gcont efficiently. A DC bias voltage of 0 to 6.1 V is adequate to vary μc of Gcont from 0 to 0.6 eV for achieving tunable A(f). The structure maintains its ultra-thin nature and has a thickness of only λ0/1500, where λ0 is the free space wavelength calculated at 0.1 THz. In addition, the periodicity is only λ0/300. The MSA also provides stable absorption response from 0.1 to 11.5 THz with A(f) ≥ 80% for incidence angle (θ) up to 60 under both transverse magnetic (TM) and transverse electric (TE) polarization.

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来源期刊
Current Applied Physics
Current Applied Physics 物理-材料科学:综合
CiteScore
4.80
自引率
0.00%
发文量
213
审稿时长
33 days
期刊介绍: Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications. Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques. Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals. Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review. The Journal is owned by the Korean Physical Society.
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