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A dimer formed by two nanoparticles, separated by a gap , is polarized by the action of an external electric field ; a molecule is placed in the middle of the gap. can be polarized along the main axis of the dimer (panel (a)) or perpendicularly to the axis (panel (b)). The blue arrows inside the nanoparticles represent the induced dipoles. This figure is inspired from Moskovits [221].
