Grating Analysis and Smoothly Modulated Grating Parameters on Lightguides
Abstract
In order to control the uniformity and efficiency in a lightguide device for AR/MR applications, it is necessary to vary grating parameters, such as fill factor and grating height, over certain areas, e.g. in the expansion and outcoupling grating regions.
For this purpose, VirtualLab Fusion enables the introduction of smoothly varied grating parameters inside one region, where the desired variation can be configured in very different ways. This also includes a tool to investigate the provided diffraction efficiencies for the specific incident conditions and grating parameters. This example explains, how to apply these tools.
VirtualLab Fusion Configuration
-
VirtualLab Fusion
Are you interested in further reading?
Tutorial
Footprint Analysis of Lightguides for AR/MR Applications
The Footprint and Grating Analysis tool allows the optical designer to determine how the light will interact with the various grating regions of the lightguide.
Tutorial
Construction of a Light Guide
Light guides with coupling gratings can be set up in VirtualLab Fusion using the Light Guide component and its flexible region definition.
Use Case
Modeling of a HoloLens 1 - Type Layout with Light Guide Component
This use case demonstrates the modeling of a device of a simple “HoloLens 1”-type layout with a Light Guide component capable of guiding light with a 32° × 18° FoV.
Tutorial
Light Guide Layout Design Tool
The Layout Design tool allows to design a custom “Hololens 1”-like augmented or mixed reality system according to the desired specifications.
Tutorial
k-Domain Layout Visualization
We explain the physical concepts employed in the k-Layout Visualization tool and demonstrates its usage.
Use Case
Simulation of Lightguide with 1D-1D Pupil Expander and Real Gratings
The investigation of the influence of real gratings on the efficiency and uniformity of a lightguide are of essential importance. This use case shows an example with a slanted grating as incoupler and binary surface relief grating as EPE and outcoupler.