Brillouin-Wigner perturbation theory in open electromagnetic systems

Muljarov, Egor A. ORCID: https://orcid.org/0000-0002-2878-4148, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Zimmermann, R. 2010. Brillouin-Wigner perturbation theory in open electromagnetic systems. Europhysics Letters 92 (5) , 50010. 10.1209/0295-5075/92/50010

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Abstract

A Brillouin-Wigner perturbation theory is developed for open electromagnetic systems which are characterised by discrete resonant states with complex eigenenergies. Since these states are exponentially growing at large distances, a modified normalisation is introduced that allows a simple spectral representation of the Green's function. The perturbed modes are found by solving a linear eigenvalue problem in matrix form. The method is illustrated on exactly solvable one- and three-dimensional examples being, respectively, a dielectric slab and a microsphere.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	EDP Sciences
ISSN:	0295-5075
Last Modified:	17 Oct 2022 10:12
URI:	https://orca.cardiff.ac.uk/id/eprint/7331

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