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<p>In this study, we propose a broadband tunable terahertz metamaterial absorber using rotationally symmetric single-layer graphene structure. The absorber exhibits strong and stable performance across a wide frequency range, achieving a broadband absorption bandwidth of nearly 2.02 THz with absorptance exceeding 90%. The broadband response arises from the coupling of multiple resonance modes engineered through geometric optimization of a symmetric square patch with centered cross graphene patch. Near-field electric field distributions and impedance matching analyses are employed to investigate the physical mechanisms underlying the absorption behavior. The absorption characteristics demonstrate high sensitivity to both the Fermi energy level and structural parameters, enabling effective tunability. Owing to the structure’s rotational symmetry, the absorber maintains polarization insensitivity and stable performance for oblique incidence angles up to 50°. The proposed design offers a promising route for applications in terahertz sensing, stealth technology, and electromagnetic wave control.</p>

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Numerical demonstration of a tunable graphene-based metamaterial for broadband THz absorption

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Ahmed Ali,
  • Asrafali Barkathulla,
  • Wazie M. Abdulkawi,
  • Median Zeghid,
  • Hassan Yousif Ahmed,
  • Yosef T. Aladadi

摘要

In this study, we propose a broadband tunable terahertz metamaterial absorber using rotationally symmetric single-layer graphene structure. The absorber exhibits strong and stable performance across a wide frequency range, achieving a broadband absorption bandwidth of nearly 2.02 THz with absorptance exceeding 90%. The broadband response arises from the coupling of multiple resonance modes engineered through geometric optimization of a symmetric square patch with centered cross graphene patch. Near-field electric field distributions and impedance matching analyses are employed to investigate the physical mechanisms underlying the absorption behavior. The absorption characteristics demonstrate high sensitivity to both the Fermi energy level and structural parameters, enabling effective tunability. Owing to the structure’s rotational symmetry, the absorber maintains polarization insensitivity and stable performance for oblique incidence angles up to 50°. The proposed design offers a promising route for applications in terahertz sensing, stealth technology, and electromagnetic wave control.