Fig. 1. Schematic diagram of the sensor unit structure

Fig. 2. Analysis of the metasurface resonance performance. (a) Transmission spectra of metasurface under different asymmetric parameters; (b) electric field distribution of mode A and mode B

Fig. 3. Variation curve of Q factor with asymmetric parameter

Fig. 4. Influence of grating geometry parameters on transmission spectra. (a) Transmission spectra with different grating thicknesses; (b) transmission spectra with different grating widths

Fig. 5. Influence of the surrounding dielectric properties of the metasurface on transmission spectrum. (a) Transmission spectra at different refractive indices; (b) resonant frequency shifts of mode A and mode B under different refractive indices