Main Question or Discussion Point
Ok so I was wondering, lets say I have a device (eg., shaped like a toothpaste box with the two square ends cut off). I make 2 of the opposite faces from copper plate and the other 2 from iron plate (for example). I then generate an electric field in the box with the copper plates, and a magnetic field from the iron plates. If I pulse both the E and B fields at visible light frequency, will the result be visible light in the box?