Fano resonance and sensing application based on terahertz asymmetric split-ring metasurfaces

Recently, Fano resonance metamaterials have attracted considerable attention in the field of terahertz modulator and sensitive detection due to its high quality factor, sensitivity to the environment, and simple structure. Here, a Fano resonance and sensing application based on terahertz asymmetric split-ring resonators metasurfaces been investigated. The Fano resonance exhibits a strong dependence on both the symmetry of the meta-atoms and the rotation angle of the metasurface. Exploiting the high sensitivity of Fano resonance to conductivity, we employed indium oxide film as the analyte to validate the sensitive detection of Fano resonance to conductivity. Furthermore, we enhanced the sensitivity by introducing rotation, enabling the detection of even smaller vari-ations in the conductivity of perovskite film. This research provides an important experimental and theoretical foundation for further investigating the mechanisms of Fano resonance and exploring its potential in sensor applications.