The size of waveguide is frequency dependant...

Then what, new, are you saying? Light is just like RF, just a different F,
therefore a different scale to see the effects. They have already made
antennas that emit light - they are very small, but they work the way radio
antennas work. I'd be surprised if a suitably scaled wave guide (of an
appropriate material) did NOT work with visible light.

I'm also not sure what you mean by:

Although light is not conducted like RF

Jose


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