Nanoscopy Nobel Prize - why are all the tools in the visible light range? It seems like all the new advances in molecular imaging/microscopy are in the visible light range of the EM spectrum. An example would be the most recent Nobel Prize for Chemistry.

Is there some reason we are only looking for things in the visible part of the EM spectrum? I'd love to know why, and also what techniques look outside of this range?
As far as fluorophores go, if the excitation wavelength is too short (&lt; 350 nm), the incident light will get stuck in the microscope.  Near-infrared fluorophores, on the other hand, suffer from several drawbacks, especially low quantum yields from competing non-radiative processes.