Fig. 1. Schematic diagram of the composite micro-nano structure. (a) Three-dimensional view; (b) side view

Fig. 2. Effect of the number of graphene layers on its electrical conductivity. (a) Imaginary part of the conductivity; (b) real part of the conductivity

Fig. 3. Effect of the number of graphene layers on the dielectric constant and refractive index. (a) Dielectric constant; (b) refractive index

Fig. 4. Absorption spectra of micro-nano structures. (a) Absorption spectrum of single-layer graphene; (b) absorption spectrum of multilayer graphene; (c) effect of dielectric constant on the absorption spectrum of micro-nano structure; (d) effect of the number of graphene layers on the absorption spectra of micro-nano structures

Fig. 5. Absorption and reflection spectra of micro-nano structures at different periods. (a) Absorption spectrum; (b) reflection spectrum

Fig. 6. Optical properties of micro-nano structures. (a) Micro-nano structures with different numbers of graphene layers; (b) Micro-nano structures with different dielectric layer thicknesses

Fig. 7. Absorption spectra of micro-nano structures at different incident angles. (a) TM mode; (b) TE mode