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<p>Metamaterials offer a wide range of applications, and bio-sensing and detection are the prominent ones. A near-perfect graphene THz absorber is proposed in this paper. The suggested structure consists of unequal-width circular rings of graphene over a TOPAS dielectric spacer. The design is modeled and analyzed using the finite element method and simulated in COMSOL Multiphysics. The analysis is carried out by evaluating the impact of Fermi energy, relaxation time, analyte thickness, and refractive index. The reported structure shows a high absorption of 0.9959 at 1.525 THz, a quality factor of 4.94, and a figure of merit of 5.795 due to the high field confinement of both electric and magnetic fields. The analyte refractive index change from 1.33 to 1.41 emanates profound variation in resonance frequency and sensitivity of the stated THz absorber. A high sensitivity value of 1850 GHz/RIU and a reasonably good frequency shift are achieved. This frequency shift exhibits that the designed THz absorber has the potential to be employed as a biosensor to differentiate among healthy and malignant samples.</p>

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Performance Analysis of Graphene Metamaterial Absorber for Terahertz Regime

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Shanu Tripathi,
  • Ashok Kumar Kherodia

摘要

Metamaterials offer a wide range of applications, and bio-sensing and detection are the prominent ones. A near-perfect graphene THz absorber is proposed in this paper. The suggested structure consists of unequal-width circular rings of graphene over a TOPAS dielectric spacer. The design is modeled and analyzed using the finite element method and simulated in COMSOL Multiphysics. The analysis is carried out by evaluating the impact of Fermi energy, relaxation time, analyte thickness, and refractive index. The reported structure shows a high absorption of 0.9959 at 1.525 THz, a quality factor of 4.94, and a figure of merit of 5.795 due to the high field confinement of both electric and magnetic fields. The analyte refractive index change from 1.33 to 1.41 emanates profound variation in resonance frequency and sensitivity of the stated THz absorber. A high sensitivity value of 1850 GHz/RIU and a reasonably good frequency shift are achieved. This frequency shift exhibits that the designed THz absorber has the potential to be employed as a biosensor to differentiate among healthy and malignant samples.