Fig. 1: 3D schematic diagrams of the designed meta-element and coding metasurface.
From: Real-time programmable metasurface for terahertz multifunctional wave front engineering
a The 2DEG-embedded meta-element, where the labeled geometric dimensions are: element period d, SiC thickness h, strip length l, and width of strips and bias-ground wires w. The patch (width a, length b) on one side breaks the symmetry of the meta-element with respect to the central gate electrode. b The cross-sectional diagram of the AlGaN/GaN HEMT. c The real-time controlled coding metasurface. As one of the functions, the sketch of beam scanning carried with modulated information is shown on the metasurface
