Fig. 1. Structure diagram and band diagram of “PC-Metal-PC”. (a) Schematic model of the structure; (b) photonic crystal dispersion diagram

Fig. 2. Comparison of reflection spectra and field intensity distribution of the two structures. (a) Comparison of simulated reflection spectra of the two structures; (b) comparison of experimental reflection spectra of the two structures; (c) field strength and dielectric constant distribution of the “PC-Metal” structure; (d) field strength and dielectric constant distribution of the “PC-Metal-PC” structure

Fig. 3. “PC-Metasurface-PC” structure model and reflection spectrum simulation diagram. (a) Schematic diagram of structural parameter; (b) simulation diagram of reflection spectrum variation with incident direction in FDTD solution

Fig. 4. Experimental processing flow chart and SEM diagram of “PC-Metasurface-PC” sample. (a) Flow chart of experimental processing of the sample; (b) SEM top view of metasurface etched with FIB; (c) SEM cross-section of sample structure

Fig. 5. Reflection spectra at different polarization angles. (a) Reflection spectrum of TE polarization incidence; (b) reflection spectrum of TM polarization incidence; (c) reflection spectrum obtained by FDTD scanning the incident light polarization angle from 0° to 90°; (d) reflectance spectrum obtained by measuring the polarization angle of incident light from 0° to 90° of the experimental sample by ARMS