Ok topic was rather unscientific i know, but yes, i want to know, what are the highest frequency waves that are laboratory producable? also, what are the limiting factors in designing devices capable of reaching upwards of the YoctoHertz range for example. how are the frequencies generated in the first place? also lets just be hypothetical here, no need to come crashing down on me with a "it can't be done because of XXX limitation in currently known technology". lets just assume that we have access to an infinite selection of materials, capable of performing any required task, what are the variables which must be manipulated to achieve higher and higher level frequencies?