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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. 14, Iss. 7 — Jul. 1, 1997
  • pp: 1592–1598

Improved formulation of the coupled-wave method for two-dimensional gratings

Philippe Lalanne  »View Author Affiliations


JOSA A, Vol. 14, Issue 7, pp. 1592-1598 (1997)
http://dx.doi.org/10.1364/JOSAA.14.001592


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Abstract

A new formulation of the coupled-wave method for two-dimensional gratings is proposed. It is based on mathematical and physical results recently obtained for one-dimensional gratings. Numerical evidence obtained for many different diffraction problems, including dielectric, metallic, volume, and surface-relief gratings, shows that the new formulation outperforms the conventional one in terms of convergence rates. The specific case of gratings with very small thickness, for which opposite conclusions on the convergence performance are obtained, is studied and explained. The methodology can be applied to other numerical techniques that rely on Fourier expansions of the electromagnetic fields and on grating parameters such as the permittivity and the permeability.

© 1997 Optical Society of America

History
Original Manuscript: September 4, 1996
Revised Manuscript: December 23, 1996
Manuscript Accepted: December 23, 1996
Published: July 1, 1997

Citation
Philippe Lalanne, "Improved formulation of the coupled-wave method for two-dimensional gratings," J. Opt. Soc. Am. A 14, 1592-1598 (1997)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-14-7-1592


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References

  1. Ph. Lalanne, G. M. Morris, “Highly improved convergence of the coupled-wave method for TM polarization,” J. Opt. Soc. Am. A 13, 779–784 (1996). [CrossRef]
  2. G. Granet, B. Guizal, “Efficient implementation of the coupled-wave method for metallic lamellar gratings in TM polarization,” J. Opt. Soc. Am. A 13, 1019–1023 (1996). [CrossRef]
  3. Ph. Lalanne, “Convergence performance of the coupled-wave and the differential methods for thin gratings,” J. Opt. Soc. Am. A 14, 1583–1591 (1997). [CrossRef]
  4. L. Li, “Use of Fourier series in the analysis of discontinuous periodic structures,” J. Opt. Soc. Am. A 13, 1870–1876 (1996). [CrossRef]
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  9. S. Peng, G. M. Morris, “Efficient implementation of rigorous coupled-wave analysis for surface relief gratings,” J. Opt. Soc. Am. A 12, 1087–1096 (1995). [CrossRef]
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  12. This was confirmed by numerical computation results. Also, it can be understood by considering the work of Ref. 4 and by noting that the submatrix Ω1 operates over continuous variables, namely, the magnetic-field vectors.
  13. Ph. Lalanne, D. Lemercier-Lalanne, “On the effective medium theory of subwavelength periodic structures,” J. Mod. Opt. 43, 2063–2085 (1996). [CrossRef]
  14. M. Nevière, P. Vincent, R. Petit, “Sur la théorie du réseau conducteur et ses applications à l’optique,” Nouv. Res. Opt. 5, 65–77 (1974).
  15. J. Turunen, “Form-birefringence limits of Fourier-expansion methods in grating theory,” J. Opt. Soc. Am. A 13, 1013–1018 (1996). [CrossRef]
  16. E. B. Grann, M. G. Moharam, D. A. Pommet, “Artificial uniaxial and biaxial dielectrics with use of two-dimensional subwavelength binary grating,” J. Opt. Soc. Am. A 11, 2695–2703 (1994). [CrossRef]
  17. It can be shown that, in the quasi-static limit, β/k0 is larger than 1/a0,0 and smaller than ∊0,0. Thus, for any arbitrary grating geometry, a solution for α of ηx(α)=β/k0 [or ηy(α)=β/k0] exists in the interval [0, 1]. For more details see S. R. Coriel, J. L. Jackson, “Bound on transport coefficients of two-phase materials,” J. Appl. Phys. 39, 4733–4736 (1968). [CrossRef]
  18. Ph. Lalanne, D. Lemercier-Lalanne, “Depth dependence of the effective properties of subwavelength gratings,” J. Opt. Soc. Am. A 14, 450–458 (1997). [CrossRef]

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