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The eye-tracking-driven programmable metasurface (ETDPM) and its properties. The 3-dimensional (3D) view (A), top view (B), and bottom (C) view of the ETDPM. (D) Representation of diode switching states and polarization direction of reflected waves. The amplitude (E) and phase (F) under the 4 states, which achieve two 1-bit groups and allow linear-to-circular polarization conversion. (G) The current distribution of the meta-atom under the 4 states.
