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We propose a tunable ultra-broadband terahertz (THz) absorber using a graphene-based metamaterial (MM) structure on a TOPAS substrate. The absorber employs a hybrid design with TOPAS as both substrate and superstrate, enabling enhanced electrical connectivity through integrated connectors. Two configurations—square- and circular-shaped MM unit cells—are analyzed. Simulations in COMSOL Multiphysics reveal that the circular MM structure achieves a broader absorption bandwidth (1.2–4.7 THz) compared to the square MM (1.2–4.6 THz), demonstrating a 0.1 THz advantage. Both unit cells share identical symmetry and surface area, yet geometric variations lead to distinct absorption characteristics. These findings highlight the potential for tuning absorption bandwidth and peak positions through shape, layering, and MM configuration.

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Shape-Dependent Ultra-Broadband Terahertz Absorbing Graphene-Based Metamaterial Structure

  • 会议论文

  • 发表日期：

    2026年

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  • Nidhi Sharma,
  • Kamal Kishor,
  • Abhishek Verma,
  • Avshish Kumar,
  • Ravinder Pal,
  • V. K. Jain

摘要

We propose a tunable ultra-broadband terahertz (THz) absorber using a graphene-based metamaterial (MM) structure on a TOPAS substrate. The absorber employs a hybrid design with TOPAS as both substrate and superstrate, enabling enhanced electrical connectivity through integrated connectors. Two configurations—square- and circular-shaped MM unit cells—are analyzed. Simulations in COMSOL Multiphysics reveal that the circular MM structure achieves a broader absorption bandwidth (1.2–4.7 THz) compared to the square MM (1.2–4.6 THz), demonstrating a 0.1 THz advantage. Both unit cells share identical symmetry and surface area, yet geometric variations lead to distinct absorption characteristics. These findings highlight the potential for tuning absorption bandwidth and peak positions through shape, layering, and MM configuration.