Fig. 2: Meta-atom design and verification.
a Schematic of proposed meta-atom geometric structure, where periodicity is a = 8.8 mm, radius of circular aperture in the grid layer is r = 3 mm, thickness of each dielectric substrate is h = 1 mm, px and py are the length and width of metallic patch, wx and wy are the dimensions of rectangular gap in the metallic patch, g is the distance between two adjacent gaps, and ϑ is the interior rotation angle between three patch layers. b 3D view of meta-atom with original state and c the output phase profiles of four channels against length px of the patch layer for verifying propagation phase. d 3D view of meta-atom with only interior rotation and e the output phase profiles of four channels against interior rotation angles for demonstrating chirality-assisted phase. f 3D view of meta-atom with only exterior rotation and g the output phase profiles of four channels against exterior rotation angles for demonstrating geometric phase.
