Fig. 1. Model and transmittance spectra of graphene array structure. (a) Structure of cross tie-shaped graphene array; (b) transmittance spectra of vertical, horizontal, and cross tie-shaped graphene array

Fig. 2. Influence of graphene chemical potential on spectrum. (a) Transmittance spectra under different graphene chemical potentials; (b) relationship among chemical potential, wavelength, and transmittance of graphene

Fig. 3. Influence of number of graphene layers on spectrum. (a) Transmittance spectra under different graphene layers; (b) relationship among number of graphene layers, resonance wavelengths λres1, λres2, and transmittance tres1, tres2

Fig. 4. Influences of graphene structural parameters on spectrum. (a) Transmission spectra under different H1; (b) electric field intensity distributions (|E|) of resonant wavelength λres1 under different H1

Fig. 5. Influences of graphene structural parameters on spectrum. (a) Transmission spectra under different H2; (b) electric field intensity distributions (|E|) of resonant wavelength λres2 under different H2

Fig. 6. Sensing characteristics of refractive index sensor with cross tie-shaped graphene structure. (a) Transmission spectra under different refractive index n; (b) relationship between refractive index and resonance wavelengths λres1, λres2; (c) relationship among refractive index, full width at half maximum of transmission valley, and quality factor