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Accurate near-field calculation in the rigorous coupled-wave analysis method

Weismann, M; Gallagher, DFG; Panoiu, NC; (2015) Accurate near-field calculation in the rigorous coupled-wave analysis method. Journal of Optics , 17 (125612) 10.1088/2040-8978/17/12/125612. Green open access

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Abstract

The rigorous coupled-wave analysis (RCWA) is one of the most successful and widely used methods for modeling periodic optical structures. It yields fast convergence of the electromagnetic far-field and has been adapted to model various optical devices and wave configurations. In this article, we investigate the accuracy with which the electromagnetic near-field can be calculated by using RCWA and explain the observed slow convergence and numerical artifacts from which it suffers, namely unphysical oscillations at material boundaries due to the Gibbs phenomenon. In order to alleviate these shortcomings, we also introduce a mathematical formulation for accurate near-field calculation in RCWA, for one- and two-dimensional straight and slanted diffraction gratings. This accurate near-field computational approach is tested and evaluated for several representative test-structures and configurations in order to illustrate the advantages provided by the proposed modified formulation of the RCWA.

Type: Article
Title: Accurate near-field calculation in the rigorous coupled-wave analysis method
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/2040-8978/17/12/125612
Publisher version: http://dx.doi.org/10.1088/2040-8978/17/12/125612
Additional information: © 2015 IOP Publishing Ltd. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1477475
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