Broadband tunable nonlinear optical response in plasmonic metamaterials -INVITEDTiziana Cesca, Domenico Genchi, Raul Rangel-Rojo, Jorge A. Reyes-Esqueda and Giovanni MatteiEPJ Web Conf., 238 (2020) 11001DOI: https://doi.org/10.1051/epjconf/202023811001