Enhanced Fano Metasurfaces for Tailored Spectroscopic Detection and Exploration of Planar Structure Generality

Metasurfaces are composite materials composed of subwavelength structures arranged periodically. By designing the structural shape and excitation methods, it can exhibit fascinating optical and physical properties not present in natural materials. This property has facilitated the application of terahertz technology in sensing, gradually enriching research in the terahertz spectral range. In this work, we proposed a terahertz plasmonic biosensor based on Fano resonance, and achieved fingerprint spectroscopy detection of L-glutamine by adjusting the structural parameters of the metasurface. Moreover, we investigated the generality of high-quality factor Fano resonances in planar structures and explored the control of the number of resonant eigenpeaks by varying the number of antennas. Our approach advances the application of terahertz metasurfaces in biosensing, stimulating continuous exploration of metamaterial structure design.