Exact Boundary Conditions for Wave Propagation in Periodic Media Containing a Local Perturbation

We present in this chapter a review of some recent r esearch work about a new approach to the numerical simulation of time harmonic wave p ropagation in infinite periodic media including a local perturbation. The main difficul ty lies in the reduction of the effective numerical computations to a bounded region enclo sing the perturbation. Our objective is to extend the approach by Dirichlet-to-Neumann ( DtN) operators, well known in the case of homogeneous media (as non local transparent boun dary conditions). The new difficulty is that this DtN operator can no longer be determin ed explicitly and has to be computed numerically. We consider successively the case of a periodic waveguide and the more complicated case of the whole space. We show that the DtN operator can be characterized through the solution of local PDE cell problems, t he use of the Floquet-Bloch transform and the solution of operator-valued quadratic or linear equations. In our text, we shall outline the main ideas without going into the rigorous mathematical details. The non standard aspects of this procedure will be emphasized and nu merical results demonstrating the efficiency of the method will be presented.

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