Nonlinear subwavelength resonances and bound states in the continuum in metascreens

This paper establishes a mathematical framework for nonlinear subwavelength resonances and bound states in the continuum (BIC) in an acoustic metascreen with a cubic Kerr nonlinearity.

We first use the quasiperiodic Dirichlet-to-Neumann operator to reduce the open resonance problem to an interior nonlinear variational problem.

We then decompose the function space in which the variational problem is posed as the direct sum of two spaces and project the variational problem onto these two subspaces.

Solving the projected equations successively yields a finite-dimensional nonlinear resonance equation with controlled remainders.

We next apply the implicit function theorem near simple capacitance modes.

This proves the existence and asymptotic expansions of linear subwavelength resonance branches and their small-amplitude nonlinear continuations.

Finally, reflection symmetry gives a classification of the subwavelength branches.

We characterize the symmetric resonance branches and prove that antisymmetric branches are exact BICs in both the linear problem and the nonlinear problem.