Figure 6
(a) Phase and (b) magnitude of the spatially dependent reflection coefficient for an ideal ternary sequence diffuser (black) and a PA-metadiffuser (blue dots). The ternary sequence used, s n , is shown on top. (c) Scaled scheme of the geometry of the hybrid PA-metadiffuser. (d) Frequency dependent absorption for the total structure (blue curve) and individual slits (black curves). The inset shows the complex frequency plane representation of the reflection coefficient for the perfect absorber slits, s n = 0. (e) Frequency dependent diffusion for the PA-metadiffuser of L = 3 cm (blue), a ternary sequence diffuser using phase gratings of L = 17 cm (dashed red) and ternary sequence diffuser using phase gratings of L = 3 cm (black). (f) Far field polar response at 500 Hz of a ternary sequence with N = 8 wells (dashed-grey), the PA-metadiffuser obtained by TMM (continuous black) and FEM (dotted black), and a plane reflector of the same width as the diffusers (red line).
