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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 72, Iss. 7 — Jul. 1, 1982
  • pp: 847–852

Numerical analysis of diffraction from a grating by the mode-matching method with a smoothing procedure

K. Yasuura and Y. Okuno  »View Author Affiliations

JOSA, Vol. 72, Issue 7, pp. 847-852 (1982)

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A numerical technique based on the mode-matching method with a smoothing procedure is presented for analyzing the diffraction of electromagnetic waves by a grating. The general algorithm for the problem of an arbitrarily shaped periodic surface is described taking the case of H polarization. To show the validity of this algorithm, plane-wave diffraction by a triangular grating is analyzed, and the results are compared with those obtained by the conventional mode-matching method. It is demonstrated that the sequence of approximate solutions calculated by the algorithm presented in this paper converges to the true solution much faster than the sequence produced by the conventional mode-matching method. Some numerical examples on the efficiency are presented.

© 1982 Optical Society of America

K. Yasuura and Y. Okuno, "Numerical analysis of diffraction from a grating by the mode-matching method with a smoothing procedure," J. Opt. Soc. Am. 72, 847-852 (1982)

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  1. Interested readers can find the references in R. Petit, ed., Electromagnetic Theory of Gratings (Springer-Verlag, Berlin, 1980).
  2. H. Ikuno and K. Yasuura, "Improved point matching method with application to scattering from a periodic surface," IEEE Trans. Antennas Propag. AP-21, 657–662 (1973). The numerical technique employed in this paper was named the IPMM because the conventional point-matching method was just improved by doubling the number of testing points. The convergence of the IPMM solution can be proved even if Rayleigh's infinite series fails to converge.3
  3. K. Yasuura and T. Itakura, "Approximation method for wave function," Kyushu Univ. Tech. Rep. 38, 72–77 (1965); 38, 378–385 (1966); 39, 51–56 (1966) (in Japanese). This paper deals with the fundamental theory of the CMMM including the completeness theorem of the set of the modal functions; its contents are briefly presented in K. Yasuura, "A view of numerical methods in diffraction problems," in Progress in Radio Science, W. V. Tilson and M. Sauzade, eds. (International Union of Radio Science, Brussels, 1971), pp. 257–270.
  4. K. Yasuura, Y. Okuno, and H. Ikuno, "Numerical analysis of echelette grating—smoothing process on mode-matching method," Trans. Inst. Electron. Commun. Eng. Jpn. 60-B, 189–196 (1977) (in Japanese). The smoothing procedure in a primitive form was presented in the paper cited. The authors have made some refinements of the theory of the procedure and, consequently, the numerical algorithm explained in the present paper was developed.
  5. H. Ikuno and K. Yasuura, "Numerical calculation of the scattered field from a periodic deformed cylinder using the smoothing process on the mode-matching method," Radio Sci. 13, 937–946 (1978).
  6. K. Yasuura and Y. Okuno, "Singular-smoothing procedure on Fourier analysis," Mem. Fac. Eng. Kyushu Univ. 41, 123–141 (1981).
  7. Y. Okuno and K. Yasuura, "Numerical algorithm based on the mode-matching method with singular-smoothing procedure for analysing edge-type scattering problems," IEEE Trans. Antennas Propag. (to be published).
  8. The theory of the CMMM was presented in 1965–1966,3 although it appeared in an American journal in 1973 for the first time.2
  9. J. P. Hugonin, R. Petit, and M. Cadilhac, "Plane wave expansions used to describe the field diffracted by a grating," J. Opt. Soc. Am. 71, 593–598 (1981).
  10. P. M. van den Berg, "Reflection by a grating: Rayleigh methods," J. Opt. Soc. Am. 71, 1224–1229 (1981).
  11. The completeness of {∂nΦµ(s); µ = 0, ±1, ±2,...} holds excluding the discrete values of kD for which kyµ = 0 (cutoff of the µth-order spectral mode) occurs. The proof of the completeness was presented in the general form in Ref. 3.
  12. The speed of the convergence of the SP solutions was examined theoretically in Ref. 5, and the fact was made clear that the sequence of the SP solutions converges to the true solution more rapidly than the CMMM solutions.
  13. The proof of this lemma was given in Ref. 5. The positive integer N0 that appeared in Eq. (39) is defined as follows: Since constants are square integrable on L, there is at least one element ∂nΦv0(s) that is not orthogonal to constants in the complete set {∂;nΦµ (s)}: (1, ∂nΦv0) ≠ 0. There may be numerous ν0's for which this condition holds. Then, putting N0 = min{|ν0|}, we have the integer N0 of Eq. (39).
  14. If the cross section of the grating is represented in terms of a finite power series of x', we can evaluate the inner products analytically by the technique of integration by parts. Otherwise they must be calculated numerically by the IPMM technique; the number of divisions is equal to 2(2N = 1).
  15. The higher-order SP means the technique with higher-order integration by parts. The mathematical foundations of the higher-order SP can be found in K. Yasuura, Y. Okuno, and H. Ikuno, "Smoothing process on series expansion of functions," Kyushu Univ. Tech. Rep. 50, 463–469 (1978) (in Japanese). The method presented in the above article can be applied for the problem with sufficiently smooth boundary. For the present case, in which the boundary has edge points, the higher-order SP must be by means of the SSP whose theory is given in Ref. 6, because the higher-order derivatives of the Green function ∂ss2G(P, s), ∂sss3G(P, s),... are no longer square integrable on L.

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