Resonant-state expansion applied to planar waveguides

Armitage, L. J., Doost, M. B. ORCID: https://orcid.org/0000-0003-4682-2889, Langbein, W. ORCID: https://orcid.org/0000-0001-9786-1023 and Muljarov, E. A. ORCID: https://orcid.org/0000-0002-2878-4148 2014. Resonant-state expansion applied to planar waveguides. Physical Review A 89 (5) , 053832. 10.1103/PhysRevA.89.053832

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Abstract

The resonant-state expansion, a recently developed method in electrodynamics, is generalized here to planar open optical systems with non-normal incidence of light. The method is illustrated and verified on exactly solvable examples, such as a dielectric slab and a Bragg reflector microcavity, for which explicit analytic formulas are obtained. This comparison demonstrates the accuracy and convergence of the method. Interestingly, the spectral analysis of a dielectric slab, in terms of resonant states, reveals an influence of waveguide modes in the transmission. These modes, which on-resonance do not couple to external light, surprisingly do couple to external light for off-resonant excitation.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	American Physical Society
ISSN:	1050-2947
Funders:	Engineering and Physical Sciences Research Council
Date of First Compliant Deposit:	27 April 2016
Date of Acceptance:	14 April 2014
Last Modified:	06 May 2023 08:26
URI:	https://orca.cardiff.ac.uk/id/eprint/84950

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