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<p>In this study, a temperature-controlled terahertz metamaterial demultiplexer based on the phase-change characteristics of vanadium dioxide (VO₂) is proposed. The device is designed with a three-layer structure: The top layer is a reflection layer containing a metal resonator and a double ‘C’-shaped phase-change resonator ring; the middle layer is a polyimide dielectric layer; and the bottom layer consists of three inter-nested two-metal open resonator rings and an inner ring of VO₂ thermally modulated ring. The device achieves efficient separation of three independent terahertz bands, 0.47 THz, 0.52 THz and 0.54 THz, and demonstrates temperature-dependent switching between the 0.47 THz and high-frequency channels. The demultiplexer exhibits high isolation of more than -20&#xa0;dB with less than 1&#xa0;dB insertion loss at all target frequencies. Its synergistic characteristics of low insertion loss and excellent channel isolation meet the critical performance requirements of advanced terahertz communication systems. This dynamically tunable design based on VO₂ provides a new idea for frequency tuning of terahertz devices and shows significant application potential in the field of multi-functional photonic integration.</p>

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Controlled terahertz metamaterial demultiplexer based on vanadium dioxide

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Zeng Qu,
  • Yuanhao Huang,
  • Yuanhui Wang,
  • Xuanqi Zhang,
  • Yibing Gong,
  • Zhuoyang Li,
  • Jingsong Li,
  • Yanshi Wang,
  • Jiayun Wang,
  • Bingzhen Zhang

摘要

In this study, a temperature-controlled terahertz metamaterial demultiplexer based on the phase-change characteristics of vanadium dioxide (VO₂) is proposed. The device is designed with a three-layer structure: The top layer is a reflection layer containing a metal resonator and a double ‘C’-shaped phase-change resonator ring; the middle layer is a polyimide dielectric layer; and the bottom layer consists of three inter-nested two-metal open resonator rings and an inner ring of VO₂ thermally modulated ring. The device achieves efficient separation of three independent terahertz bands, 0.47 THz, 0.52 THz and 0.54 THz, and demonstrates temperature-dependent switching between the 0.47 THz and high-frequency channels. The demultiplexer exhibits high isolation of more than -20 dB with less than 1 dB insertion loss at all target frequencies. Its synergistic characteristics of low insertion loss and excellent channel isolation meet the critical performance requirements of advanced terahertz communication systems. This dynamically tunable design based on VO₂ provides a new idea for frequency tuning of terahertz devices and shows significant application potential in the field of multi-functional photonic integration.