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<p>In this paper, we have performed the theoretical study on tunable ultra-broadband terahertz (THz) metamaterial absorber (MA) with single vanadium dioxide (VO<sub>2</sub>) resonator. Unlike previous tunable THz MAs with multiple VO<sub>2</sub> resonators, the proposed MA only utilizes single VO<sub>2</sub> resonator, but it can operate in the range of 3.04–7.74&#xa0;THz with high absorptivity above 90% and its relative absorption bandwidth (RAB) reaches to 87.19%. Moreover, the proposed MA can achieve large modulation depth of 94.76%. The proposed MA exhibits not only polarization-insensitivity but also wide incident angle stability under both transverse electric (TE) and transverse magnetic (TM) waves. The physical origin of ultra-broadband absorption is illustrated by investigating the electric field and surface current distributions of the proposed MA. Owing to the several advantages of simple structure, wider operating bandwidth, large modulation depth and wide incident angle, the proposed THz MA may be effectively utilized for THz communications, imaging, and detecting.</p>

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Theoretical study on tunable ultra-broadband terahertz metamaterial absorber with single VO2 resonator

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • M. C. Ryu,
  • K. J. Ri,
  • K. B. Ryo,
  • M. J. Yang

摘要

In this paper, we have performed the theoretical study on tunable ultra-broadband terahertz (THz) metamaterial absorber (MA) with single vanadium dioxide (VO2) resonator. Unlike previous tunable THz MAs with multiple VO2 resonators, the proposed MA only utilizes single VO2 resonator, but it can operate in the range of 3.04–7.74 THz with high absorptivity above 90% and its relative absorption bandwidth (RAB) reaches to 87.19%. Moreover, the proposed MA can achieve large modulation depth of 94.76%. The proposed MA exhibits not only polarization-insensitivity but also wide incident angle stability under both transverse electric (TE) and transverse magnetic (TM) waves. The physical origin of ultra-broadband absorption is illustrated by investigating the electric field and surface current distributions of the proposed MA. Owing to the several advantages of simple structure, wider operating bandwidth, large modulation depth and wide incident angle, the proposed THz MA may be effectively utilized for THz communications, imaging, and detecting.