Fig. 4: Phase responses of two sets of meta-atoms selected from the meta-atom library and the corresponding normalized far-field patterns of reflective metasurfaces composed of the two sets of meta-atoms.
From: 2nd-Order Debye relaxation in electromagnetic metasurfaces for wideband dispersion engineering
a Parallel phase lines of one set of 8 meta-atoms for forming constant phase gradient in X-band: (i) rRL, (ii) rLR, (iii) the corresponding normalized far-field pattern. b phase responses of the other set of 12 meta-atoms for forming achromatic phase gradient: (i) rRL, (ii) rLR, (iii) the corresponding normalized far-field pattern, where the colored dots in panels (i) and (ii) represent the theoretically predicted phases for achromatic deflection
