Fig. 4: Experimental demonstration of the reconfigurable metasurface as a beam splitter.

a–c Schematics of the beam splitter exhibiting reconfigurable beam reflecting effect at 1–3 and 2–4 plane in undeployed (β = 0°), intermediate (β = 22.5°) and deployed states (β = 45°), respectively. Here, the geometric phase profiles carried by the devices for LCP illumination case are denoted by the color mapped on the meta-atoms, which satisfy the checkerboard-liked, sub-checkerboard and uniform distributions in the three states. The yellow and blue arrows represent the incident LP beam and the anomalous reflection CP beam, respectively. d–f Optical photographs of the fabricated beam splitter in the three states. Colors mapped on each photograph indicates the encoded geometric phase distributions for the device. Scale bar, 20 mm. g–i (i) Experimentally measured electric field intensity distributions of reflection beam with RCP at 16 GHz and (ii) within the frequency range of 12-17 GHz for the beam splitter in the three states. The field intensities at different angles are normalized against a reference signal, similar to the beam flipper. Here, the dashed line represents the theoretical prediction of the anomalous reflection angle. These results demonstrate the reconfigurable beam controlling effects, i.e., a switching between four split reflection beams and a specular reflection beam based on the RS kirigami transformation. Source data are provided as a Source Data file.