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I was recently reading how electromagnetic waves are generated using oscillation of a current in an antenna. Why is it that this principle cannot be used to generate light?

DividedByZero
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It can be done. But the frequency has to be very high which makes it useless for practical purposes.

Ari
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    Just saying it can be done is not very useful. Can you extend your answer to explain how it can be done. It can't be done with regular conductors because their plasma frequency is too low. – John Rennie Sep 13 '15 at 15:02
  • Plus they would have to be very small to couple sufficiently strong to the short wavelength radiation to produce noticeable output. – Sebastian Riese Sep 13 '15 at 15:29
  • I just meant it is theoretically possible. Sorry for the misunderstanding. I am searching if anything of this sort has been done experimentally. I'll notify. – Ari Sep 14 '15 at 03:24