drudel theory of optics

Dear colleague,

Nowadays the research on Near-field Optics more and more concentrated on nanostructures. Is there someone also engaged in this topic? Let's share our experience on calculation, theory and experiment.

My first question is:

in the nanoscale, the theory of electromagnetic theory based on maxwell equation still approriate or not? Is it necessary to switch to quantum theory?

Not all nano-devices are trying to take advantage of some quantum effect, can we say that?

in metal nanostructure, we can just solve maxwell equations combined with drude model. but for my understanding, the drudel model is not take into account quantum effect, is that right??