A polarization-insensitive broadband metamaterial absorber including a sandwiched graphene material sheet for multitudinous terahertz applications

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-03-31 DOI:10.1016/j.diamond.2025.112262

Srilakshmi Aouthu , Ravi Shankar Reddy Gosula , Sudipta Das , Naglaa F. Soliman , Nagandla Prasad

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Abstract

This research article presents the design technique and characterization of a metamaterial-based broadband multi-layered absorber that functions in the terahertz frequency range and exhibits polarization independence. The suggested absorber is made up of four layers: a gold layer that conducts electricity at the base of the structure, a dielectric layer made of lossy silicon, a graphene layer that acts as a conductor, and finally, an extra gold layer is added for generating resonance and to attain impedance matching between free space and metamaterial. The tunability of the absorption band has been examined by adjusting the Fermi chemical potential and relaxation time of the graphene material. By implementing an appropriate Fermi chemical potential (μ_c) of 0.2 eV and a relaxation time (t_r) of 0.1 ps in the graphene layer, the recommended configuration can attain a broad bandwidth of 2.47 THz (9.42 THz to 11.89 THz) with a fractional bandwidth (FBW) of 23.18 %, maintaining the absorptivity level above 90 %. The proposed design exhibits compact physical dimensions of 20 × 20 μm² and an electrical size of 0.628 λ₀ × 0.628 λ₀, where λ₀ corresponds to the wavelength calculated at the lowest operating frequency. The suggested absorber is effective for multiple terahertz applications, including high-speed communications, imaging, sensing, and environmental monitoring.

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一种偏振不敏感的宽带超材料吸收器，包括一层夹在中间的石墨烯材料片，可用于多种太赫兹应用

本文介绍了一种基于超材料的宽带多层吸收材料的设计技术和特性，该吸收材料在太赫兹频率范围内工作，具有极化无关性。该吸收器由四层组成：在结构底部导电的金层，由有损耗硅制成的介电层，充当导体的石墨烯层，最后，额外增加的金层用于产生共振并实现自由空间和超材料之间的阻抗匹配。通过调整石墨烯材料的费米化学势和弛豫时间，考察了吸收带的可调性。通过在石墨烯层中实现适当的费米化学势（μc）为0.2 eV和弛豫时间（tr）为0.1 ps，推荐的结构可以获得2.47 THz （9.42 ~ 11.89 THz）的宽带，分数带宽（FBW）为23.18%，吸收率保持在90%以上。所提出的设计具有紧凑的物理尺寸为20 × 20 μm2，电气尺寸为0.628 λ0 × 0.628 λ0，其中λ0对应于最低工作频率时计算的波长。该吸收剂适用于多太赫兹应用，包括高速通信、成像、传感和环境监测。

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

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.