Optimization of Grating Geometries in Lightguide Systems

In our last newsletter we highlighted the capabilities of the fast physical optics software VirtualLab Fusion to analyze the performance of lightguide systems. This time we address a closely related step in the design workflow: the optimization of the grating geometries used in the coupling and expansion regions of the system.

VirtualLab Fusion offers a series of powerful tools for this task: for instance, detectors that calculate fundamental merit functions like uniformity and efficiency, and moreover the possibility to implement a (custom) smooth variation of the grating parameters along a specific region of the layout. The latter approach can drastically decrease the number of free parameters in the optimization while at the same time retaining crucial flexibility. For more information, check out the examples below!

Optimization of Lightguide with Continuously Modulated Grating Regions

This use case demonstrates how to optimize a lightguide with continuously varying fill factor of the gratings in the EPE and outcoupler regions to achieve adequate lateral uniformity in the eyebox.

Introduction to the Parametric Optimization Document

VirtualLab Fusion provides three local and one global optimization algorithm. This use case introduces the associated Parametric Optimization document with its options and settings.

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