Stacked metasurfaces are being investigated in light of exploring exotic optical effects that cannot be achieved with single-layered metasurfaces. In this article, we theoretically demonstrate that metallic wire-grid metasurfaces with specific polarization properties have the ability to induce tunable Fano resonances when they are stacked. The developed original model—combining a circulating field approach together with an extended Jones formalism—reveals the underlying principle that gives rise to the polarization-induced Fano resonances. The theoretical frame is validated in an experimental proof of concept using commercially available wire-grids and a terahertz time domain spectrometer. This unexplored possibility opens an alternative path to the realization and control of Fano resonances by using stacked metallic metasurfaces. Furthermore, these findings suggest that the polarization can be used as an additional degree of freedom for the design of optical resonators with enhanced and tunable properties.

鉴于探索单层超表面无法实现的奇异光学效应，正在研究堆叠超表面。在本文中，我们从理论上证明了具有特定极化特性的金属线栅超表面在堆叠时能够引起可调谐的 Fano 共振。开发的原始模型——将循环场方法与扩展的琼斯形式主义相结合——揭示了引起极化诱导的 Fano 共振的基本原理。理论框架在使用商用线栅和太赫兹时域光谱仪的概念实验证明中得到验证。这种未开发的可能性为通过使用堆叠金属超表面实现和控制 Fano 共振开辟了一条替代途径。此外，