Originally posted by sonhouse
Time will tell if this works out but it may be the development we have been waiting for. Little antenna's tuned to light frequency instead of solid state layers.
They were impossible to fabricate before this new technique was developed.
I really hope it is as premising as it sounds!
At first, I was confused by the bit where it says:
“...The nano-antennas – known as "rectennas" because of their ability to both absorb and rectify solar energy from alternating current to direct current – must be capable of operating at the speed of visible light ...”
-mainly because I did not understand where this “alternating current” originates because it doesn't make this perfectly clear.
But then I found this which explains it:
“...Incident light on the antenna causes electrons in the antenna to move back and forth at the same frequency as the incoming light. This is caused by the oscillating electric field of the incoming electromagnetic wave. The movement of electrons is an alternating current in the antenna circuit. ...”