ABSTRACT
In this chapter, the mechanism of plasmonic coupling of the near-
fields that takes place when nanostructures are very close to each
other is described. After a theoretical introduction illustrating the
main physical principles governing plasmonic coupling, several
experimental systems are considered. Interestingly, experimental
results show that both periodic and rigid, random, and flexible
systems of gold nanoparticles exhibit a universal scaling behavior
and verify the plasmonic ruler equation.
