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. 2016 Mar 30;6:23731. doi: 10.1038/srep23731

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(a) The single-sensor and single-frequency imaging system based on the 2-bit programmable coding metasurface. (b) The sampled information of the generalized system response matrix (G11, G15, G33, G51, and G55) calibrated under the 25 different programmable patterns in our measurements. For each randomly varied curve, it can prove that the diodes are working in the experiments. (c–e) The photographs of three metallic objects: the horizontal bar (c), the T-type object (d), and the T-type object rotated by 90 degrees (e). (f–h) The imaging results of the three metallic objects at 9.2 GHz: the horizontal bar (f), the T-type object (g), and the T-type object rotated by 90 degrees (h).