Nonlinear interaction of two trapped-mode resonances in a bilayer   fish-scale metamaterial
  We report on a bistable light transmission through a bilayer "fish-scale" (meander-line) metamaterial. It is demonstrated that an all-optical switching may be achieved nearly the frequency of the high-quality-factor Fano-shaped trapped-mode resonance excitation. The nonlinear interaction of two closely spaced trapped-mode resonances in the bilayer structure composed with a Kerr-type nonlinear dielectric slab is analyzed in both frequency and time domains. It is demonstrated that these two resonances react differently on the applied intense light which leads to destination of a multistable transmission. 
Vladimir R. Tuz, Denis V. Novitsky, Pavel L. Mladyonov, Sergey L.   Prosvirnin, Andrey V. Novitsky
physics.optics