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<p>We propose a vanadium dioxide-based reconfigurable terahertz metasurface with switchable ultra-broadband polarization conversion and ultra-broadband absorption. By employing a dual-layer architecture consisting of an anisotropic vanadium dioxide-gold mosaic layer and a symmetric vanadium dioxide circular-patch layer, the proposed design independently optimizes the two functions and breaks the inherent bandwidth-performance trade-off. In the insulating state, the device realizes an ultra-broadband polarization conversion with a polarization conversion ratio above 90% from 0.9 to 2.69 THz, corresponding to a relative bandwidth of 99.7%, and exhibits high angular stability. In the metallic state, it functions as a polarization-insensitive ultra-broadband absorber with absorptivity over 90% from 1.9 to 5.875 THz, achieving a relative bandwidth of 102.2% and excellent angular robustness. The working mechanisms including interference-assisted phase control and cascaded impedance matching are systematically revealed. The proposed structure provides a new paradigm for high-performance multifunctional reconfigurable terahertz photonic devices with high integration, wide bandwidth, and strong angular stability.</p>

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Ultra-broadband multifunctional reconfigurable terahertz metasurface based on vanadium dioxide

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Can Tang,
  • Shengbing Zhang,
  • Hongyan Wang,
  • Yixuan Wan,
  • Jinchuan Huang,
  • Weiwei Zhang,
  • Wanru Cai,
  • Xingfang Luo

摘要

We propose a vanadium dioxide-based reconfigurable terahertz metasurface with switchable ultra-broadband polarization conversion and ultra-broadband absorption. By employing a dual-layer architecture consisting of an anisotropic vanadium dioxide-gold mosaic layer and a symmetric vanadium dioxide circular-patch layer, the proposed design independently optimizes the two functions and breaks the inherent bandwidth-performance trade-off. In the insulating state, the device realizes an ultra-broadband polarization conversion with a polarization conversion ratio above 90% from 0.9 to 2.69 THz, corresponding to a relative bandwidth of 99.7%, and exhibits high angular stability. In the metallic state, it functions as a polarization-insensitive ultra-broadband absorber with absorptivity over 90% from 1.9 to 5.875 THz, achieving a relative bandwidth of 102.2% and excellent angular robustness. The working mechanisms including interference-assisted phase control and cascaded impedance matching are systematically revealed. The proposed structure provides a new paradigm for high-performance multifunctional reconfigurable terahertz photonic devices with high integration, wide bandwidth, and strong angular stability.