Hi, I'm new. From what I understand, radio waves are generated these days using alternating currents or mechanically moving charges. The highest frequencies that modern technology reaches is somewhere in the bottom of infrared. Theoretically speaking, is it possible to emit visible light using the same techniques? All we need is higher frequencies, right? Also, are all possible frequencies "charted"? That is, there's radio, micro, infrared, visible light, ultraviolet, gamma... But this can go on to infinity; so do we know what happens to extremely high frequencies of electromagnetic waves? Thanks.