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Breaking reciprocity via STC digital metasurfaces. Reproduced from [113]. (a) Conceptual illustration of realizing nonreciprocal reflection effect based on an STC digital metasurface. (b) Photograph of the fabricated 2-bit programmable metasurface. (c) 2-bit STC matrix with dimension 16 × 4. (d) Equivalent amplitudes and phases for the STC matrix in (c).
