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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

  • Vol. 12, Iss. 5 — May. 1, 1995
  • pp: 1077–1086

Stable implementation of the rigorous coupled-wave analysis for surface-relief gratings: enhanced transmittance matrix approach

M. G. Moharam, Drew A. Pommet, Eric B. Grann, and T. K. Gaylord  »View Author Affiliations


JOSA A, Vol. 12, Issue 5, pp. 1077-1086 (1995)
http://dx.doi.org/10.1364/JOSAA.12.001077


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Abstract

An enhanced, numerically stable transmittance matrix approach is developed and is applied to the implementation of the rigorous coupled-wave analysis for surface-relief and multilevel gratings. The enhanced approach is shown to produce numerically stable results for excessively deep multilevel surface-relief dielectric gratings. The nature of the numerical instability for the classic transmission matrix approach in the presence of evanescent fields is determined. The finite precision of the numerical representation on digital computers results in insufficient accuracy in numerically representing the elements produced by inverting an ill-conditioned transmission matrix. These inaccuracies will result in numerical instability in the calculations for successive field matching between the layers. The new technique that we present anticipates and preempts these potential numerical problems. In addition to the full-solution approach whereby all the reflected and the transmitted amplitudes are calculated, a simpler, more efficient formulation is proposed for cases in which only the reflected amplitudes (or the transmitted amplitudes) are required. Incorporating this enhanced approach into the implementation of the rigorous coupled-wave analysis, we obtain numerically stable and convergent results for excessively deep (50 wavelengths), 16-level, asymmetric binary gratings. Calculated results are presented for both TE and TM polarization and for conical diffraction.

© 1995 Optical Society of America

History
Original Manuscript: September 20, 1994
Revised Manuscript: December 5, 1994
Manuscript Accepted: December 6, 1994
Published: May 1, 1995

Citation
M. G. Moharam, T. K. Gaylord, Drew A. Pommet, and Eric B. Grann, "Stable implementation of the rigorous coupled-wave analysis for surface-relief gratings: enhanced transmittance matrix approach," J. Opt. Soc. Am. A 12, 1077-1086 (1995)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-12-5-1077


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References

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