Gorlach, Maxim A.Voytova, Tatiana A.Lapine, MikhailBelov, Pavel A.Kivshar, Yuri2016-10-122016-10-122469-9950http://hdl.handle.net/1885/109271We present a consistent theoretical approach for calculating effective nonlinear susceptibilities of metamaterials taking into account both frequency and spatial dispersion. Employing the discrete dipole model, we demonstrate that effects of spatial dispersion become especially pronounced in the vicinity of effective permittivity resonance where nonlinear susceptibilities reach their maxima. In that case spatial dispersion may enable simultaneous generation of two harmonic signals with the same frequency and polarization but different wave vectors. We also prove that the derived expressions for nonlinear susceptibilities transform into the known form when spatial dispersion effects are negligible. In addition to revealing new physical phenomena, our results provide useful theoretical tools for analysing resonant nonlinear metamaterials.This work was financially supported by Russian Science Foundation (Grant No. 15-19-30023), the Dynasty Foundation and the Australian Research Council. M.G. acknowledges a visiting appointment at the University of Technology Sydney (via ARC DP 150103611).8 pages© 2016 American Physical Society. http://www.sherpa.ac.uk/romeo/issn/2469-9950/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 12/10/16).Nonlocal homogenization for nonlinear metamaterials2016-03-0110.1103/PhysRevB.93.165125