Surface Plasmons ??? Well, to begin with, I am not a physicist and therefore please dont redirect me to some physics tutorials. now the question: Why is it necessary for surface plasmon exitation by light that the incident light must have component normal to the surface? I know that this condition can be fulfilled only in case of p-polarized light. but my questioin is about necessity of normal component. Pls, if anyone can explain this to me, I would be much obliged.