759830.fig.001a
(a)
759830.fig.001b
(b)
Figure 1: Illustrations of (a) surface plasmon resonance (SPR) and (b) localized surface plasmon resonance (LSPR), resulting from the collective oscillations of delocalized electrons in response to an external electric field. Reprinted with permission from [14]. Copyright 2007 Annual Review of Physical Chemistry.