If light is just an EM phenomena like radio waves (with more energy) would it be possible to build a transmitter that transmits in the light range? If you were to do this, would you see light that just seems to propagating from the antenna?
Well no, but it can via the Photoelectric effect. The filament coil won't be as efficient as a large plate but it should work. But here's the interesting part - I think antennas are said to be reciprocal devices.Originally posted by arcnets
Nonono - radiation must be coherent from an antenna
Plus it must work 2-way. Ever seen a lightbulb convert light into electricity?
anybody heard of laser-diodes? The ones used in CD-players.....It's called a light bulb.
Yes. Antenna theory has to do with the Fourier-transform of the e.m. field. You can transform only pure (coherent) states, not mixed states.Originally posted by mmwave
Is this related to coherence as an assumption in a working antenna?