Utilizing nanometer-scale parts, analysts have shown the primary optical rectenna, a gadget that joins the elements of a recieving wire and a rectifier diode to change over light straightforwardly into DC current. In view of multiwall carbon nanotubes and minor rectifiers manufactured onto them, the optical rectennas could give another innovation to photodetectors that would work without the requirement for cooling, vitality collectors that would change over waste warmth to electricity — and at last for another approach to productively catch sun powered vitality. In the new gadgets, created by engineers at the Georgia Institute of Technology, the carbon nanotubes go about as radio wires to catch light from the sun or different sources. As the influxes of light hit the nanotube recieving wires, they make a swaying charge that travels through rectifier gadgets joined to them. The rectifiers turn on and off at record high petahertz speeds, making a little direct present. Bil