3D scattering by an array of rods using the Gaussian beam formalism coupled to the scattering matrix method

An innovative method is proposed to compute the field scattered by an array of rods illuminated by a 3D regular field. The incident field is described as a sum of few Gaussian beams. The scattered field is derived with the Scattering Matrix Method introducing a paraxial approximation on each elementary incident Gaussian beam. Numerical and experimental tests reveal a good trade-off between the accuracy and the computational effort.