"Earth-abundant Cu-based metal oxide photocathodes for photoelectrochemical water splitting" (2020) https://pubs.rsc.org/en/content/articlelanding/2020/ee/d0ee0...
LightSlinger antennae are FTL within the dielectric, but the EMR is not FTL; from https://news.ycombinator.com/item?id=37342016 :
> "Smaller, more versatile antenna could be a communications game-changer" (2022) https://news.ycombinator.com/item?id=37337628 :
> LightSlingers use volume-distributed polarization currents, animated within a dielectric to faster-than-light [FTL] speeds, to emit electromagnetic waves. (By contrast, traditional antennas employ surface currents of subluminally moving massive particles on localized metallic elements such as dipoles.) Owing to the superluminal motion of the radiation source, LightSlingers are capable of “slinging” tightly focused wave packets with high precision toward a location of choice. This gives them potential advantages over phased arrays in secure communications such as 4G and 5G local networks