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Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Say you made a radio circuit that transmits at 563909.77 GHz (532nm wavelength). Wouldn't the energy emitted from the antenna be green light? Now obviously a circuit like this won't be built with our current technology, but it's kind of crazy to think about, light radio.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Fraggle wrote ...
That got me wondering if you could get `beats` from the superposition of two light waves that fall in the radio spectrum.
Oh yes, in fact that's a way to test the bandwidth of fast optical receivers. For example, mix light from 2 lasers of same intensity and 10 GHz frequency separation, you get a sinusoidal 10 GHz amplitude modulation. (for that you need lasers with much narrower spectral width than common laser diodes).
Look up wavelength division multiplexing (in optical fiber communication). In the quartz fiber low-attenuation sweet spot around 1550 nm wavelength, the standard channel wavelengths are actually defined in terms of frequency (whole multiples of 100 GHz, or 200, or 50). Just as in radio, the channel spacing places a limit on the, uh, bandwidth per channel.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
All those digits and it is all wrong after the third...
There is nothing special with any part of the elecromagnetic spectrum, the energy per photon rises with frequency and it gradually becomes more interesting as photons become capable of breaking bonds and knocking things around.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
It might be possible to build near PHz oscillators with deep sub-micron superconducting circuits, but it's a couple orders of magnitude from what has been accomplished (THz).
It has been done in the other direction though ... metal-oxide-metal diodes can rectify the electric field from light.
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Klugesmith wrote ...
Why would you call it a radio circuit instead of a lamp?
Because you modulate electron flows inside a circuit to create an EM field ... rather than bumping electrons (or photons) into molecules and using molecular oscillation phenomena to do it (which is what we usually do in lamps and lasers).
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I was thinking...
