Fig. 1. Metal-dielectric-metal slow optical waveguide

Fig. 2. Schematic of metamaterial absorber structure model. (a) Three-dimensional structure; (b) plane diagram of structural elements

Fig. 3. PHWA model in FDTD. (a) PHWA plan; (b) PHWA three-dimensional picture

Fig. 4. Optical absorption efficiency of PHWA under different polarization states. (a) Light absorption, reflection, and transmission of PHWA under TM polarization; (b) light absorption of PHWA under TE and TM polarizations

Fig. 5. Influence of material thickness on absorption bandwidth. (a) Metal layer thickness; (b) dielectric layer thickness

Fig. 6. Effect of N on absorption bandwidth

Fig. 7. Effect of waveguide layer width on absorption bandwidth

Fig. 8. PHWA magnetic field distribution at different wavelengths. (a) 1 μm; (b) 1.5 μm; (c) 2 μm

Fig. 9. Effect of different incident angles on PHWA absorption efficiency