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<p>Metamaterial structures are versatile systems with unique characteristics, enabling various practical applications. Metamaterial absorbers (MAs) have recently gained significant attention for their remarkable absorption capabilities and tunable features. Terahertz (THz) MAs with sub-wavelength unit cells can manipulate THz radiation by either absorbing or transmitting it through carefully engineered structures. This study examines how unit cell design and structural parameters, including layer thickness, radius, and rod length, influence absorption spectra such as number of absorption peaks and bandwidth of multi-layer MAs in the THz range. The proposed multi-layer structure of MAs is composed of five layers arranged sequentially from bottom to top: a gold metal layer, a polydimethylsiloxane (PDMS) dielectric layer, a vanadium dioxide (VO<sub>2</sub>) layer, a second PDMS dielectric layer and a top layer combining VO₂ with graphene. The findings show that adjusting the structural parameters can enhance the number of absorption peaks, reduce the bandwidth, and shift the spectrum. The proposed THz MAs have potential applications in diverse fields, including biosensors, photodetectors, and photonic switches.</p>

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Designing Terahertz Metamaterial Absorbers Using Multi-Layer VO₂–Graphene Structures

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Zahra Farrokhi,
  • Hassan Pakarzadeh,
  • Zahra Owjifard

摘要

Metamaterial structures are versatile systems with unique characteristics, enabling various practical applications. Metamaterial absorbers (MAs) have recently gained significant attention for their remarkable absorption capabilities and tunable features. Terahertz (THz) MAs with sub-wavelength unit cells can manipulate THz radiation by either absorbing or transmitting it through carefully engineered structures. This study examines how unit cell design and structural parameters, including layer thickness, radius, and rod length, influence absorption spectra such as number of absorption peaks and bandwidth of multi-layer MAs in the THz range. The proposed multi-layer structure of MAs is composed of five layers arranged sequentially from bottom to top: a gold metal layer, a polydimethylsiloxane (PDMS) dielectric layer, a vanadium dioxide (VO2) layer, a second PDMS dielectric layer and a top layer combining VO₂ with graphene. The findings show that adjusting the structural parameters can enhance the number of absorption peaks, reduce the bandwidth, and shift the spectrum. The proposed THz MAs have potential applications in diverse fields, including biosensors, photodetectors, and photonic switches.