Parametric Optimization and Tolerance Analysis of Slanted Gratings
Abstract
Coupling of light into guiding structures with high efficiency is an important issue for many applications, like backlight, optical interconnector, and near-to-eye displays. For such applications, slanted gratings are well-known for being capable to couple monochromatic light with high efficiency. In this example, the optimization of a slanted grating with the rigorous Fourier modal method (FMM, also known as RCWA) is presented. The optimized grating shows a diffraction efficiency of over 90% for a predefined direction order. In addition, the influence from the slope deviation and the rounded edges of the grating are investigated.
VirtualLab Fusion Configuration
-
VirtualLab Fusion
-
Grating Package
Are you interested in further reading?
Use Case
Analysis of Slanted Gratings for Lightguide Coupling
Different slanted grating geometries are selected from literature, with varying slant angle, fill factor, and modulation depth, and the diffraction efficiencies are calculated with the Fourier modal method (FMM).
Use Case
Optimization of Lightguide Coupling Grating for Single Incidence Direction
We demonstrate the design workflow for optimizing a rectangular grating for one specific incidence direction to obtain maximum efficiency for a specific diffraction order.
Tutorial
Introduction to the Parametric Optimization Document
Three local and one global optimization algorithm are provided. This Tutorial introduces the associated Parametric Optimization document.
Tutorial
Advanced Configuration of Slanted Gratings
Coated slanted gratings can be configured easily within VirtualLab. This tutorial explains the available options for the customization of slanted gratings.
Tutorial
Configuration of Grating Structures by Using Interfaces
In VirtualLab Fusion, grating structures are configured in a “stack”, which can be constructed with either a sequence of interfaces or special media, depending on the geometry of the grating.
Tutorial
Grating Order Analyzer
In VirtualLab Fusion, the Grating Order Analyzer can be used for convenient grating diffraction analysis, with results presented in various ways.