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On the spectrum of an operator pencil with applications to wave propagation in periodic and frequency dependent materials
ETH Zurich, Switzerland.
2009 (English)In: SIAM Journal on Applied Mathematics, ISSN 0036-1399, E-ISSN 1095-712X, Vol. 70, no 1, p. 231-247Article in journal (Refereed) Published
Abstract [en]

We study wave propagation in periodic and frequency dependent materials when the medium in a frequency interval is characterized by a real-valued permittivity. The spectral parameter relates to the quasi momentum, which leads to spectral analysis of a quadratic operator pencil where frequency is a parameter. We show that the underlying operator has a discrete spectrum, where the eigenvalues are symmetrically placed with respect to the real and imaginary axis. Moreover, we discretize the operator pencil with finite elements and use a Krylov space method to compute eigenvalues of the resulting large sparse matrix pencil.

Place, publisher, year, edition, pages
2009. Vol. 70, no 1, p. 231-247
Keywords [en]
periodic structure, band-gap, Bloch wave, quadratic eigenvalue, gyroscopic, operator pencil
National Category
Other Mathematics
Research subject
Mathematics, Mathematics
Identifiers
URN: urn:nbn:se:lnu:diva-81938DOI: 10.1137/080728779OAI: oai:DiVA.org:lnu-81938DiVA, id: diva2:1304772
Available from: 2019-04-13 Created: 2019-04-13 Last updated: 2019-05-13Bibliographically approved

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Engström, Christian

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