Commun. Comput. Phys., 11 (2012), pp. 629-646.

Asymptotics for Helmholtz and Maxwell Solutions in 3-D Open Waveguides

Carlos Jerez-Hanckes 1*, Jean-Claude Nedelec 2

1 Seminar fur Angewandte Mathematik, ETH Zurich, Ramistrasse 101, 8092 Zurich, Switzerland; and Escuela de Ingenieria, Pontificia Universidad Catolica de Chile, Av. Vicuna Mackenna 4860, Santiago, Chile.
2 Centre de Mathematiques Appliquees, Ecole Polytechnique, 91128 Palaiseau, France.

Received 23 December 2009; Accepted (in revised version) 15 September 2010
Available online 24 October 2011


We extend classic Sommerfeld and Silver-Muller radiation conditions for bounded scatterers to acoustic and electromagnetic fields propagating over three iso-tropic homogeneous layers in three dimensions. If $\Vx=(x_1,x_2,x_3)\in\R^3$, with $x_{3}$ denoting the direction orthogonal to the layers, standard conditions only hold for the outer layers in the region $\abs{x_3}>\norm{\Vx}^\gamma$, for $\gamma\in(1/4,1/2)$ and $\Vx$ large. For $\abs{x_3}<\norm{\Vx}^\gamma$ and inside the slab, asymptotic behavior depends on the presence of surface or guided modes given by the discrete spectrum of the associated operator.

AMS subject classifications: 35C15, 35Q60, 78A45

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Key words: Open waveguide, radiation condition, Helmholtz equation.

*Corresponding author.
Email: (C. Jerez-Hanckes), (J.-C. Nedelec)

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