Open source models for the parametric study of diffraction gratings in 2D/2.5D/3D with ONELAB/Gmsh/GetDP

TL;DR

This paper presents open source ONELAB/Gmsh/GetDP models for simulating diffraction gratings in 2D, 2.5D, and 3D, covering various geometries, materials, and polarization cases with practical energy balance outputs.

Contribution

It introduces new open source models for diffraction gratings that integrate Gmsh, GetDP, and ONELAB, enabling comprehensive 2D/3D simulations with flexible geometries and materials.

Findings

Models handle various geometries and materials.

Full energy balance computed from field maps.

Applicable to mono-dimensional and crossed gratings.

Abstract

This document aims at presenting both theoretical and practical aspects of the grating2D.pro and grating3D.pro [1] ONELAB [2] models. The 2D model grating2D.pro applies to so-called mono-dimensional gratings, i.e. structures having one direction of invariance. Various geometries and materials can be handled or easily added. The two classical scalar polarization cases, denoted here E// and H//, are addressed as well as the conical vector case. The output consists in a full energy balance of the problem computed from the field maps. The 3D vector model grating3D.pro applies to crossed-gratings. These models are based on free the open source software Gmsh, GetDP and their interface ONELAB. [1] https://gitlab.onelab.info/doc/models/-/wikis/Diffraction-gratings [2] https://onelab.info