Resonant-state expansion of light propagation in nonuniform waveguides

Lobanov, Sergey ORCID: https://orcid.org/0000-0002-3126-1903, Zorinyants, Georgy, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Muljarov, Egor ORCID: https://orcid.org/0000-0002-2878-4148 2017. Resonant-state expansion of light propagation in nonuniform waveguides. Physical Review A 95 (5) , 053848. 10.1103/PhysRevA.95.053848

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Abstract

A rigorous approach for precise and efficient calculation of light propagation along nonuniform waveguides is presented. Resonant states of a uniform waveguide, which satisfy outgoing-wave boundary conditions, form a natural basis for expansion of the local electromagnetic field. Using such an expansion at fixed frequency, we convert the wave equation for light propagation in a nonuniform waveguide into an ordinary second-order matrix differential equation for the expansion coefficients depending on the coordinate along the waveguide. We illustrate the method on several examples of nonuniform planar waveguides and evaluate its efficiency compared to the aperiodic Fourier modal method and the finite element method, showing improvements of one to four orders of magnitude. A similar improvement can be expected also for applications in other fields of physics showing wave phenomena, such as acoustics and quantum mechanics.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	2469-9926
Funders:	EPSRC
Date of First Compliant Deposit:	7 June 2017
Date of Acceptance:	15 April 2017
Last Modified:	19 Nov 2024 08:00
URI:	https://orca.cardiff.ac.uk/id/eprint/101244

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