Metamaterials enable the control of electromagnetic fields over sub-wavelength scales. In addition to field enhancement effects, metamaterials offer an unprecedented control over the phase of electromagnetic fields, which is of paramount importance in coherent nonlinear optical processes. Here we explore frequency conversion effects in nanostructured media. The coherent interactions arising in ensembles of nanostructures lead to a very rich phenomenology and a unique set of degrees of freedom with which to engineer the overall nonlinear response of the system. In particular we here discuss novel phase-matching schemes in ensembles of discrete nonlinear scatterers. Keywords: Metamaterials, Plasmonics, Nonlinear Optics.
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