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<p>Manipulating terahertz (THz) electromagnetic waves through engineered metamaterials offers unprecedented control over absorption and reflection phenomena. However, integrating broadband tunability and polarization stability into a single, structurally simple device remains a demanding challenge. This research investigates the optical characteristics of two periodically adjustable plasma perfect metamaterial absorbers that utilize a single-layer graphene patch. One of the absorbers features a closed-cross design, while the other employs a periodic circular array structure. The absorption bandwidth was modified by varying the conductivity of graphene through impurity doping and mechanical stretching. The operating mode of the absorbers can switch between dual-band and ultra-wideband. The graphene–polyimide metasurface absorber achieved greater than 99% absorptivity at a frequency of 6.5103 THz, with a bandwidth of 0.1084 THz within the 6–12 THz range, leading to a fractional bandwidth of 116%. The graphene–Teflon metasurface absorber attained over 90% absorptivity and exhibited excellent performance within the 8.606–9.572 THz interval, resulting in a fractional bandwidth of 211% including wide-angle tolerance. The viability of the integrated modes was confirmed through structural analysis. In comparison to other absorber designs, these configurations are significantly straightforward, making them suitable for applications in sensing, solar energy collection, spectroscopy, and stealth technologies.</p>

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Performance Analysis of Graphene-Functionalized Wideband Metasurface Absorber for Terahertz Band Applications

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Abdullah Al Saeed,
  • Bashir Ahammed,
  • Sadia Sultana

摘要

Manipulating terahertz (THz) electromagnetic waves through engineered metamaterials offers unprecedented control over absorption and reflection phenomena. However, integrating broadband tunability and polarization stability into a single, structurally simple device remains a demanding challenge. This research investigates the optical characteristics of two periodically adjustable plasma perfect metamaterial absorbers that utilize a single-layer graphene patch. One of the absorbers features a closed-cross design, while the other employs a periodic circular array structure. The absorption bandwidth was modified by varying the conductivity of graphene through impurity doping and mechanical stretching. The operating mode of the absorbers can switch between dual-band and ultra-wideband. The graphene–polyimide metasurface absorber achieved greater than 99% absorptivity at a frequency of 6.5103 THz, with a bandwidth of 0.1084 THz within the 6–12 THz range, leading to a fractional bandwidth of 116%. The graphene–Teflon metasurface absorber attained over 90% absorptivity and exhibited excellent performance within the 8.606–9.572 THz interval, resulting in a fractional bandwidth of 211% including wide-angle tolerance. The viability of the integrated modes was confirmed through structural analysis. In comparison to other absorber designs, these configurations are significantly straightforward, making them suitable for applications in sensing, solar energy collection, spectroscopy, and stealth technologies.