If it is possible to produce EM waves(light) by two perpendicular fields, why there isn't any such bulb?

Question

if it is possible to produce electromagnetic waves(light) by two perpendicular electric & magnetic fields,then why there aren't such bulbs or sources of light?

Can we produce light of any frequency with these two perpendicular fields?

Answer 1

The wavelengths for light are too short for emission by traditional radio antennas, if that is what you are asking.


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...No one had been able to make a device small enough to act as an antenna for light until the team fashioned one from the microscopic nanotubes built out of carbon atoms.

"Nobody had tried it in optical frequencies," Kempa said. "Nobody talks about antennas for light. Antennas are for radio."...