The research team that announced the first optical rectenna in 2015 is now reporting a two-fold efficiency improvement in the devices -- and a switch to air-stable diode materials. The improvements ...

Rectifying antennas – "rectennas" – are used as parasitic power capture devices that absorb radio frequency (RF) energy and convert it into usable electrical power. Constructing such devices to absorb ...

Developed by engineers at the Georgia Institute of Technology, optical rectennas use carbon nanotubes that act as antennas to capture light from the sun or other sources. As the waves of light hit the ...