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<p>In this paper, a graphene terahertz perfect absorber with a periodic array structure is proposed, which is a three-layer structure consisting of a metal substrate, a dielectric layer, and graphene. time-domain finite-difference algorithm is utilized to investigate the optical properties of the proposed structure and its variants after parameter adjustments. The simulation results show that the graphene perfect absorber has one peak of 0.1–2.7&#xa0;THz with an absorption rate of 99.30% over 90%. The absorption rate depends on both the thickness of the dielectric layer and the geometric configuration of the absorber. With the increase in the thickness of the dielectric layer, the absorption peak is slightly shifted, and the absorption rate decreases rapidly. Therefore, the regulation of the absorption peak frequency and absorption rate of graphene perfect absorber can be realized by adjusting the thickness of the dielectric layer and the device structure. The asymmetric Fabry–Perot model can explain the physical mechanism. The results of the study have good application prospects in the fields of terahertz absorption, biosensing and aerospace stealth technologies.</p>

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Metamaterial terahertz perfect absorber based on periodic micrometer band structure

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Xiaoyue Lu,
  • Xianbin Zhang,
  • Shihan Zhao

摘要

In this paper, a graphene terahertz perfect absorber with a periodic array structure is proposed, which is a three-layer structure consisting of a metal substrate, a dielectric layer, and graphene. time-domain finite-difference algorithm is utilized to investigate the optical properties of the proposed structure and its variants after parameter adjustments. The simulation results show that the graphene perfect absorber has one peak of 0.1–2.7 THz with an absorption rate of 99.30% over 90%. The absorption rate depends on both the thickness of the dielectric layer and the geometric configuration of the absorber. With the increase in the thickness of the dielectric layer, the absorption peak is slightly shifted, and the absorption rate decreases rapidly. Therefore, the regulation of the absorption peak frequency and absorption rate of graphene perfect absorber can be realized by adjusting the thickness of the dielectric layer and the device structure. The asymmetric Fabry–Perot model can explain the physical mechanism. The results of the study have good application prospects in the fields of terahertz absorption, biosensing and aerospace stealth technologies.