Figure 2.

Numerical calculations and design of the individual meta‐atoms. The height (h) and the periodicity (p) of the meta‐atoms were fixed at h = 500 nm and p = 350 nm throughout. The calculated a) phase delay and b) total transmission from meta‐atoms with L_x and L_y from 50 to 250 nm under x‐polarized incident light. Note that values of L_x ² + L_y ² > p² are omitted due to the possibility of protruding outside of the unit cell when being rotated to employ the geometric phase. c) The calculated phase difference between x‐ and y‐polarized incident light. Values that satisfy a phase difference of >80% of π are denoted by pink circles. d) The selected geometries for the meta‐atoms to cover the required 2π range for propagation phase, while also functioning as half‐wave plates. The selected geometries are highlighted with red crosses in (a), (b), and (c), while the numbers in (a) relate to the corresponding geometry. e) The calculated phase (red circles) along with the required phase (green dashed line) for the 8‐step discretization. The calculated phases align well with the required ones, while the transmission (blue crosses) provide a total average transmission of over 95%.