Ambient-energy-driven space-time-coding metasurface integrates energy harvesting, EM wave manipulation and information modulation

https://www.eurekalert.org/news-releases/1118068

"programmable metasurfaces require external power, overcome integrating solar cell chip onto each meta-atom harvesting up to 12 mW/cm² far exceeding 0.66 mW/cm² operating consumption (1.3 hours charging powers 24 hours continuous operation... coding method achieves independent multi-beamforming across multiple harmonic frequencies simultaneously, enabling several independent communication channels...  real-time transmitted 4 different image streams to 4 separate users... 17.4 mW/ bit power consumption"