The metasurfaces that support high‐Q resonances can provide ultra‐sharp resonance and achieve strong light‐matter interaction, which promotes their application in various fields such as sensing, lasing, and imaging. Bound modes, unable to radiate into free space, can be transformed into quasi‐bound modes and coupled with external radiation, achieving high‐Q resonances. For periodic structures, by introducing appropriate periodic perturbations, the guided modes (GMs) below the light line can be exposed above the light line, forming the high‐Q quasi‐guide modes (QGMs). Herein, a metallic metasurface is designed that supports the QGM in the continuum by introducing the Brillouin zone folding strategy. The simulation and experiment demonstrate that the GM below the light line can be transformed into the QGM in the continuum by tuning the distance parameter, and a typical “electromagnetic‐induced transparency‐like (EIT‐like)” spectrum is observed. The design unlocks additional degrees of freedom for generating high‐Q metallic metasurface. The advantage of avoiding the production of asymmetric defects contributes to releasing the strict requirement on manufacturing precision. The combination of the metallic metasurface supporting QGM resonance with high‐Q factors and the flexible substrate can improve the performance of the flexible devices and broaden its application in terahertz optoelectronic devices.

中文翻译：

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距离驱动的太赫兹金属超表面支持连续体中的 QGM

支持高超表面问共振可以提供超尖锐的共振并实现强的光与物质相互作用，这促进了它们在传感、激光和成像等各个领域的应用。束缚模无法辐射到自由空间，可以转化为准束缚模并与外部辐射耦合，实现高问共振。对于周期性结构，通过引入适当的周期性扰动，光线下方的导模（GM）可以暴露在光线上方，形成高问准引导模式（QGM）。在此，设计了一种金属超表面，通过引入布里渊区折叠策略来支持连续体中的 QGM。模拟和实验表明，通过调整距离参数，可以将光线以下的GM转变为连续介质中的QGM，并观察到典型的“类电磁诱导透明（EIT-like）”光谱。该设计释放了额外的自由度来产生高问金属超表面。避免产生不对称缺陷的优点有助于释放对制造精度的严格要求。支持 QGM 共振的金属超表面与高问因素和柔性基板可以提高柔性器件的性能并拓宽其在太赫兹光电器件中的应用。