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<p>In this work, we present a thermally tunable ultra-broadband terahertz metamaterial absorber that makes use of the phase transition property of vanadium dioxide (VO<sub>2</sub>). Systematic simulations demonstrate that this design exhibits absorption exceeding 90% across the 6.23–16.08 THz range, corresponding to a relative bandwidth of 88.3%. Notably, near-ideal absorption values of 99.66% and 99.84% are found at 9.14 THz and 14.63 THz, in that order. The macroscopic electromagnetic behavior is interpreted via relative impedance calculations, while the underlying physical mechanisms are clarified through surface electric field distributions at absorption extrema. By utilizing VO<sub>2</sub>’s reversible insulator-to-metal transition (with conductivity spanning 2 × 10<sup>2</sup> S/m up to 2 × 10<sup>5</sup> S/m), continuous absorption tuning is realized based on dynamic impedance matching. Characterization under varying polarization and incident angles confirms polarization insensitivity and wide-angle stability. This absorber holds promising applications in terahertz detection, biosensing, and adaptive stealth technologies.</p>

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Broadband metamaterial terahertz absorption device based on vanadium dioxide

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Xinyu Deng,
  • Zao Yi,
  • Qianju Song,
  • Jianguo Zhang

摘要

In this work, we present a thermally tunable ultra-broadband terahertz metamaterial absorber that makes use of the phase transition property of vanadium dioxide (VO2). Systematic simulations demonstrate that this design exhibits absorption exceeding 90% across the 6.23–16.08 THz range, corresponding to a relative bandwidth of 88.3%. Notably, near-ideal absorption values of 99.66% and 99.84% are found at 9.14 THz and 14.63 THz, in that order. The macroscopic electromagnetic behavior is interpreted via relative impedance calculations, while the underlying physical mechanisms are clarified through surface electric field distributions at absorption extrema. By utilizing VO2’s reversible insulator-to-metal transition (with conductivity spanning 2 × 102 S/m up to 2 × 105 S/m), continuous absorption tuning is realized based on dynamic impedance matching. Characterization under varying polarization and incident angles confirms polarization insensitivity and wide-angle stability. This absorber holds promising applications in terahertz detection, biosensing, and adaptive stealth technologies.