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<p>This paper presents a polarization-insensitive metasurface absorber, specifically engineered for applications in the terahertz (THz) frequency range. The development and investigation is motivated by the inherent polarization-dependent limitations of a single graphene strip, which functions as a broadband absorber only when its orientation is perpendicular to the incident electric field. It is observed that as the polarization angle varies, the broadband absorption breaks down and the overall absorption significantly diminishes. To overcome this, a centrosymmetric, cross-shaped graphene pattern is proposed. The study also takes a deep drive into this geometric dependency of polarization insensitivity by analyzing the electric field response of single and cross shaped design. Using Impedance Matching theory and Equivalent Circuit analysis this phenomenon is further evaluated. The proposed structure performance, analyzed using a 3D Finite Element Method simulation, demonstrates over 90% absorption across a broad bandwidth from 0.12 to 1.9 THz. A detailed analysis of the surface current density further elucidates the mechanism behind this polarization-insensitive and broadband behavior. The combination of dynamic tunability offered by graphene and its wide-angle, broadband absorption capabilities makes this proposed absorber well-suited for advanced THz technologies in fields such as imaging, sensing, and communication.</p>

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Theoretical investigation of the polarization insensitivity in graphene-based-cross-shaped metasurface Terahertz (THz) absorber

  • 期刊论文

  • 发表日期：

    2026年1月24日

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  • Aminur Rahman,
  • Safayat-Al Imam

摘要

This paper presents a polarization-insensitive metasurface absorber, specifically engineered for applications in the terahertz (THz) frequency range. The development and investigation is motivated by the inherent polarization-dependent limitations of a single graphene strip, which functions as a broadband absorber only when its orientation is perpendicular to the incident electric field. It is observed that as the polarization angle varies, the broadband absorption breaks down and the overall absorption significantly diminishes. To overcome this, a centrosymmetric, cross-shaped graphene pattern is proposed. The study also takes a deep drive into this geometric dependency of polarization insensitivity by analyzing the electric field response of single and cross shaped design. Using Impedance Matching theory and Equivalent Circuit analysis this phenomenon is further evaluated. The proposed structure performance, analyzed using a 3D Finite Element Method simulation, demonstrates over 90% absorption across a broad bandwidth from 0.12 to 1.9 THz. A detailed analysis of the surface current density further elucidates the mechanism behind this polarization-insensitive and broadband behavior. The combination of dynamic tunability offered by graphene and its wide-angle, broadband absorption capabilities makes this proposed absorber well-suited for advanced THz technologies in fields such as imaging, sensing, and communication.