Metamaterials are artificial materials with unique electromagnetic properties not found in nature and couldexhibit a strong electromagnetic resonance with frequency. These characteristics depending on the geometry, dimensions,compositions of the structure, and even the symmetry. In this study, we demonstrated a highly sensitive detection methodof glycerol-water solutions using terahertz metamaterials fabricated on silicon substrate with metal arrays of theasymmetric double split-ring resonator structure. We measured the transmitted spectra of the metamaterial to detect thewater-glycerol solutions at different concentrations by the terahertz time-domain spectroscopy system. With the increasingof glycerol concentration, resonant dips of metamaterial exhibit the blue-shift phenomena and transmittance at theresonance frequency simultaneously enhance. The movement of resonant dips and the change of transmittance shows thatthese resonators are sensitive to the variation of glycerol concentration. The finite-difference time-domain simulation agreewell with the experimental data, and the simulation of surface current and electric field distribution at resonance dips canfurther understand the resonance modes in transmission spectra. Our study provides new prospect into the application ofterahertz metamaterials in detecting glycerol proportions of solution.
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