Fig. 6: Underwater 4 K video streaming using the full-color metasurface.

a Schematic of the system. b The quality metrics, PSNR and SSIM of each frame received by the CAFAB (with metasurface) or Gaussian beam (without metasurface) based UWOC system versus time. c The received video frames with and without the full-color metasurface at different frame sequences.