ON THE APPLICATION OF THE SECANT METHOD TO THE SPECTRAL ITERATIVE APPROACH

Abstract

A new iterative algorithm for calculating the electromagnetic scattering from planar, periodic gratmgs and grids was developed. Results are compared with the moment method and the Spectral Iteration (S.l.T.) method. The Secant approach is used in conjunction with the Spectral Iteration Approach to achieve convergence. It is shown that the Secant approach, which does not depend on the evaluation of numerical derivatives to achieve convergence like the contraction-corrector S.l.T. method, yields good results. Finally, suggestions for applying this method to two dimensional structures are included and discussed. [Vol. 3, No. 1, pp. 103-119 (1988)]