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(L) Flat metasurface; and (R) reflection from metasurface with linear phase gradient.
(L) Illustration of a flat metasurface (top) to imitate shading and lighting effects of a 3D cube through the normal mapping and an actual 3D cube (bottom). Light source location is marked by a small bright ball. (R) Schematic illustration of reflection from a metasurface with a linear phase gradient. Image: KCL / Nano Letters journal.
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