To date, little research has been carried out on the integration of switchable and diversified functionalities into a single metamaterial in the terahertz (THz) range. Here, a hybrid vanadium dioxide (VO2) metamaterial was designed with switchable properties of band-pass filter and band-stop filter in the frequency range of 0.3–1.6 THz. Simulations demonstrated that under TE polarization, the proposed system acted as band-stop filter with the center frequency of 0.95 THz when VO2 is in the insulating state. Upon the transformation of VO2 into the metallic state, the proposed system behaved as a band-pass filter with a transmittance of >80%. The physical mechanism of the band-pass/band-stop conversion was examined by analyzing the surface current distribution of the designed device. The switchable characteristics of this structure can enable its wide application in tunable THz functional components such as amplitude modulators, polarization control, and intelligent switches.

中文翻译：

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由混合二氧化钒超材料实现的可切换太赫兹带通/带阻滤波器

迄今为止，关于将可切换和多样化的功能集成到太赫兹 (THz) 范围内的单一超材料中的研究很少。在这里，设计了一种混合二氧化钒 (VO2) 超材料，在 0.3-1.6 THz 的频率范围内具有带通滤波器和带阻滤波器的可切换特性。仿真表明，在 TE 极化下，当 VO2 处于绝缘状态时，所提出的系统充当中心频率为 0.95 THz 的带阻滤波器。在 VO2 转变为金属态后，所提出的系统表现为带通滤波器，透射率 >80%。通过分析设计器件的表面电流分布，研究了带通/带阻转换的物理机制。