Figure 3. Metamaterial bricks.

(a) 3D rendering of a brick. (b) Cross-sections of 16 selected bricks and the corresponding phase maps at normal incidence. Each case is calculated independently by impinging a plane wave with a wavelength λ₀ through the bricks (located in between the two dashed lines), clearly showing a 2π span of the transmitted phase. Geometrical parameters for each brick are shown in Supplementary Table 1. (c) Photograph of the fabricated bricks and the grid to contain them. The numbers at the top of each brick denote the corresponding phase shift (in units of π/8). See also Supplementary Video 1.