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<p>This study presents a novel terahertz (THz) plasmonic absorber utilizing a step-shaped graphene metamaterial patch. The proposed device comprises a periodic multilayer array of gold, silicon dioxide (SiO<sub>2</sub>), and graphene, featuring graphene elements deposited on a SiO<sub>2</sub> substrate. A gold bottom plate is utilized to maximize absorption. The structure’s performance is numerically modeled and optimized via the three-dimensional finite difference time domain (FDTD) method. Simulation results exhibit near unity absorption peaks at 3.52 THz and 6.08 THz, resulting from plasmonic resonances within the graphene layers. Furthermore, the absorption frequency can be dynamically tuned by modulating the graphene’s chemical potential via external biasing. The optimized configuration achieves both high absorption and tunability within a compact footprint. We further investigate the absorber’s potential application as a refractive index sensor, demonstrating high sensitivity and an appropriate figure of merit. These simulation results indicate the promising potential of this design for THz sensing, imaging, and communication applications.</p>

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A Terahertz Tunable Plasmonic Absorber Based on Step-Shaped Graphene Patches for Sensing Applications

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Nastaran Korani,
  • Saeed Mohammadi,
  • Abdesselam Hocini,
  • Mohammad Danaie

摘要

This study presents a novel terahertz (THz) plasmonic absorber utilizing a step-shaped graphene metamaterial patch. The proposed device comprises a periodic multilayer array of gold, silicon dioxide (SiO2), and graphene, featuring graphene elements deposited on a SiO2 substrate. A gold bottom plate is utilized to maximize absorption. The structure’s performance is numerically modeled and optimized via the three-dimensional finite difference time domain (FDTD) method. Simulation results exhibit near unity absorption peaks at 3.52 THz and 6.08 THz, resulting from plasmonic resonances within the graphene layers. Furthermore, the absorption frequency can be dynamically tuned by modulating the graphene’s chemical potential via external biasing. The optimized configuration achieves both high absorption and tunability within a compact footprint. We further investigate the absorber’s potential application as a refractive index sensor, demonstrating high sensitivity and an appropriate figure of merit. These simulation results indicate the promising potential of this design for THz sensing, imaging, and communication applications.