Fig. 1. Schematic diagram of the polarization-insensitive narrow-band metamaterial perfect absorber

Fig. 2. Optical behavior analysis of a perfect absorber with a large-sized structure and a small-sized structure

Fig. 3. Effect of thickness variation of SiO₂ spacer on the reflection spectra of the perfect absorber

Fig. 4. Effects of disc diameter and periodicity on the optical response of perfect absorber structure

Fig. 5. High-performance perfect absorber obtained by optimizing structural parameters