I don't really know where this thread belongs so I'll just put it here. Im pretty confused about all these terms. I mean, a plasmon is a collective oscillation of the electrons in the material (right?), and a surface plasmon is a plasmon travelling along the surface of a material, but what are localized plasmons? And where does the term "resonance" fit in (as in surface plasmon resonance, and localized surface plasmon resonance). Are some of these just different terms for the same physical phenomena or what? Could someone please enlighten me. Thanks in advance!