Riesz bases and Jordan form of the translation operator in semi-infinite periodic waveguides

Details Riesz bases and Jordan form of the translation operator in semi-infinite periodic waveguides Riesz bases and Jordan form of the translation operator in semi-infinite periodic waveguides

2010-10-08

arxiv.org/abs/1010.1738v1

Mathematics

Analysis of PDEs

Scientific paper

We study the propagation of time-harmonic acoustic or transverse magnetic (TM) polarized electromagnetic waves in a periodic waveguide lying in the semi-strip $(0,\infty)\times(0,L)$. It is shown that there exists a Riesz basis of the space of solutions to the time-harmonic wave equation such that the translation operator shifting a function by one periodicity length to the left is represented by an infinite Jordan matrix which contains at most a finite number of Jordan blocks of size $> 1$. Moreover, the Dirichlet-, Neumann- and mixed traces of this Riesz basis on the left boundary also form a Riesz basis. Both the cases of frequencies in a band gap and frequencies in the spectrum and a variety of boundary conditions on the top and bottom are considered.

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