2015/07/22 by Martin Weismann, Weismann, Martin, Dominic F. G. Gallagher +3 · 1 citation
Engineering · Materials Science · #Advanced Antenna and Metasurface Technologies #FOS: Physical sciences #Microwave Engineering and Waveguides #Optical Coatings and Gratings #Optics (physics.optics)
paper · pdf · doi:10.48550/arxiv.1507.06364
openalex publication_date 2015/07/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The rigorous coupled-wave analysis (RCWA) is one of the most successful and\nwidely used methods for modeling periodic optical structures. It yields fast\nconvergence of the electromagnetic far-field and has been adapted to model\nvarious optical devices and wave configurations. In this article, we\ninvestigate the accuracy with which the electromagnetic near-field can be\ncalculated by using RCWA and explain the observed slow convergence and\nnumerical artifacts from which it suffers, namely unphysical oscillations at\nmaterial boundaries due to the Gibb's phenomenon. In order to alleviate these\nshortcomings, we also introduce a mathematical formulation for accurate\nnear-field calculation in RCWA, for one- and two-dimensional straight and\nslanted diffraction gratings. This accurate near-field computational approach\nis tested and evaluated for several representative test-structures and\nconfigurations in order to illustrate the advantages provided by the proposed\nmodified formulation of the RCWA.\n