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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 30, Iss. 4 — Apr. 1, 2013
  • pp: 631–639

Modal method based on subsectional Gegenbauer polynomial expansion for nonperiodic structures: complex coordinates implementation

Kofi Edee and Brahim Guizal  »View Author Affiliations


JOSA A, Vol. 30, Issue 4, pp. 631-639 (2013)
http://dx.doi.org/10.1364/JOSAA.30.000631


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Abstract

In this paper we present an extension of the modal method by Gegenbauer expansion (MMGE) [J. Opt. Soc. Am. A 28, 2006 (2011)], [Progress Electromagn. Res. 133, 17 (2013)] to the study of nonperiodic problems. The nonperiodicity is introduced through the perfectly matched layers (PMLs) concept, which can be introduced in an equivalent way either by a change of coordinates or by the use of a uniaxial anisotropic medium. These PMLs can generate strong irregularities of the electromagnetic fields that can significantly alter the convergence and stability of the numerical scheme. This is the case, e.g., for the famous Fourier modal method, especially when using complex stretching coordinates. In this work, it will be shown that the MMGE equipped with PMLs is a robust approach because of its natural immunity against spurious modes.

© 2013 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1755) Diffraction and gratings : Computational electromagnetic methods

ToC Category:
Integrated Optics

History
Original Manuscript: January 3, 2013
Manuscript Accepted: January 31, 2013
Published: March 13, 2013

Citation
Kofi Edee and Brahim Guizal, "Modal method based on subsectional Gegenbauer polynomial expansion for nonperiodic structures: complex coordinates implementation," J. Opt. Soc. Am. A 30, 631-639 (2013)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-30-4-631


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References

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