Calculation, normalization and perturbation of quasinormal modes in coupled cavity-waveguide systems

Philip Trøst Kristensen, Jakob Rosenkrantz de Lasson, Niels Gregersen

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We show how one can use a non-local boundary condition, which is compatible with standard frequency domain methods, for numerical calculation of quasinormal modes in optical cavities coupled to waveguides. In addition, we extend the definition of the quasinormal mode norm by use of the theory of divergent series to provide a framework for modeling of optical phenomena in such coupled cavity-waveguide systems. As an example, we apply the framework to study perturbative changes in the resonance frequency and Q value of a photonic crystal cavity coupled to a defect waveguide.
Original languageEnglish
JournalOptics Letters
Issue number22
Pages (from-to)6359-6362
Publication statusPublished - 2014

Bibliographical note

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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