Trapped modes for periodic structures in waveguides

Details Trapped modes for periodic structures in waveguides Trapped modes for periodic structures in waveguides

2002-07-03

arxiv.org/abs/math-ph/0207007v1

Physics

Mathematical Physics

11 pages, Latex

Scientific paper

The Laplace operator is considered for waveguides perturbed by a periodic structure consisting of N congruent obstacles spanning the waveguide. Neumann boundary conditions are imposed on the periodic structure, and either Neumann or Dirichlet conditions on the guide walls. It is proven that there are at least N (resp. N-1) trapped modes in the Neumann case (resp. Dirichlet case) under fairly general hypotheses, including the special case where the obstacles consist of line segments placed parallel to the waveguide walls. This work should be viewed as an extension of "Periodic structures on waveguides" by Linton and McIvor.

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