Broadband graphene anchored perturbed Koch fractal metamaterial absorber for THz applications

IF 4 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical and Quantum Electronics Pub Date : 2026-09-17 DOI:10.1007/s11082-026-09141-3

Sayani Bindai, Abhik Gorai, Sapana Ranwa, Rowdra Ghatak

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Abstract

In this paper, a broadband graphene augmented perturbed Koch fractal patterned terahertz metamaterial absorber (MMA) is proposed. The designed metamaterial absorber structure comprises of a top patterned graphene layer over a polytetrafluoroethylene (PTFE) dielectric substrate with a thin gold (Au) bottom layer. The evolved perturbed Koch fractal-patterned graphene exhibits wideband absorption. The detailed evolution of the Koch fractal-patterned graphene absorber has been studied. The tunability of the THz-wideband absorption spectrum can be achieved by varying the Fermi potential of the designed Koch fractal graphene absorber. The absorption spectrum of the Koch fractal absorber has been studied and optimized as a function of polarization (TE, TM), incident angle, relaxation time. The designed absorber demonstrates similar behaviour under TE and TM polarization, indicating polarization insensitivity. The designed Koch fractal absorber exhibits a broadband absorption above 90% in the frequency range of 1.37 THz to 3.40 THz with a bandwidth of 2.03 THz, at a Fermi level (E_f) of 1.0 eV. The interference theory model has been invoked to model the absorption mechanism, which closely follows the result obtained from numerical simulation. The exhibited characteristics demonstrate its potential application in THz sensor and wideband signal attenuation applications.

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宽带石墨烯锚定微扰Koch分形超材料太赫兹吸收器

本文提出了一种宽带石墨烯增强微扰Koch分形太赫兹超材料吸收体（MMA）。所设计的超材料吸收结构包括在聚四氟乙烯（PTFE）介质衬底上的顶部图案化石墨烯层，其底层为薄金（Au）。演化出的扰动科赫分形石墨烯表现出宽带吸收。研究了科赫分形石墨烯吸收体的详细演化过程。通过改变所设计的Koch分形石墨烯吸收体的费米势，可以实现太赫兹宽带吸收光谱的可调性。研究并优化了Koch分形吸收器的吸收光谱随极化（TE、TM）、入射角、弛豫时间的变化规律。所设计的吸收剂在TE和TM极化下表现出相似的特性，表明极化不敏感。所设计的Koch分形吸收器在1.37 ~ 3.40 THz频率范围内，带宽为2.03 THz，费米能级（Ef）为1.0 eV时，具有90%以上的宽带吸收。采用干涉理论模型对吸收机理进行了模拟，与数值模拟结果吻合较好。所展示的特性显示了其在太赫兹传感器和宽带信号衰减应用中的潜在应用。

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

Optical and Quantum Electronics 工程技术-工程：电子与电气

CiteScore

4.60

自引率

20.00%

发文量

810

审稿时长

3.8 months

期刊介绍： Optical and Quantum Electronics provides an international forum for the publication of original research papers, tutorial reviews and letters in such fields as optical physics, optical engineering and optoelectronics. Special issues are published on topics of current interest. Optical and Quantum Electronics is published monthly. It is concerned with the technology and physics of optical systems, components and devices, i.e., with topics such as: optical fibres; semiconductor lasers and LEDs; light detection and imaging devices; nanophotonics; photonic integration and optoelectronic integrated circuits; silicon photonics; displays; optical communications from devices to systems; materials for photonics (e.g. semiconductors, glasses, graphene); the physics and simulation of optical devices and systems; nanotechnologies in photonics (including engineered nano-structures such as photonic crystals, sub-wavelength photonic structures, metamaterials, and plasmonics); advanced quantum and optoelectronic applications (e.g. quantum computing, memory and communications, quantum sensing and quantum dots); photonic sensors and bio-sensors; Terahertz phenomena; non-linear optics and ultrafast phenomena; green photonics.