Nonlinear Modal Excitation in Coherent Metamaterials

Space and time-varying electromagnetic structures give access to regimes of operation that do not occur in their time-invariant counterparts due to modal orthogonality constraints. Using a perturbative approach, we analyze the intermodal energy transfer between a directly excited dipolar mode and a higher order subradiant mode, and suggest a coherent control strategy to enhance the conversion efficiency to higher order modes.