@Article{CiCP-1-6,
author = {},
title = {Exact Boundary Conditions for Periodic Waveguides Containing a Local Perturbation},
journal = {Communications in Computational Physics},
year = {2006},
volume = {1},
number = {6},
pages = {945--973},
abstract = {<p style="text-align: justify;">We consider the solution of the Helmholtz equation −∆u(x)−n(x)<sup>2</sup>ω<sup>2</sup>u(x) = f(x), x = (x,y), in a domain Ω which is infinite in x and bounded in y. We assume that f(x) is supported in Ω<sup>0</sup> := {x ∈ Ω |a<sup>−</sup> &lt; x &lt; a<sup>+</sup>} and that n(x) is x-periodic in Ω\Ω<sup>0</sup>. We show how to obtain exact boundary conditions on the vertical segments, Γ<sup>−</sup> := {x ∈ Ω |x = a<sup>−</sup>} and Γ<sup>+</sup> := {x ∈ Ω |x = a<sup>+</sup>}, that will enable us to find the solution on Ω<sup>0</sup> ∪Γ<sup>+</sup> ∪Γ<sup>−</sup>. Then the solution can be extended in Ω in a straightforward manner from the values on Γ<sup>−</sup> and Γ<sup>+</sup>. The exact boundary conditions as well as the extension operators are computed by solving local problems on a single periodicity cell.&nbsp;</p>},
issn = {1991-7120},
doi = {https://doi.org/2006-CiCP-7989},
url = {https://global-sci.com/article/81402/exact-boundary-conditions-for-periodic-waveguides-containing-a-local-perturbation}
}