Broadband tunable nonlinear optical response in plasmonic metamaterials -INVITED Tiziana Cesca, Domenico Genchi, Raul Rangel-Rojo, Jorge A. Reyes-Esqueda and Giovanni Mattei EPJ Web Conf., 238 (2020) 11001 Published online: 20 August 2020 DOI: 10.1051/epjconf/202023811001