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Tailored resonant waveguide gratings for augmented reality.

Matt Markowitz, Michele Cotrufo, You Zhou

|October 13, 2022

Summary

Researchers developed angularly tolerant tri-band reflection filters using resonant waveguide gratings (RWG). These filters are ideal for augmented reality displays, offering high reflection at specific wavelengths and angles while minimizing ghosting.

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Augmented reality (AR) systems require advanced optical components for displays.
Existing solutions often struggle with angular tolerance and multi-wavelength functionality.
Transparent heads-up displays (HUDs) need efficient and robust reflection filters.

Purpose of the Study:

To design and demonstrate angularly tolerant tri-band reflection filters using resonant waveguide gratings (RWG).
To optimize RWG structures for multi-frequency narrowband resonances suitable for AR applications.
To evaluate the performance and manufacturability of these filters for large-area applications.

Main Methods:

Utilizing inverse design to optimize one-dimensional grating structures.

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Theoretical analysis and experimental verification of filter performance.

Investigating fabrication using roll-to-roll techniques for industrial scalability.

Main Results:

A single RWG achieved >50% reflection at three chosen wavelengths for p-polarized light at ~58° incidence.
Narrowband resonances were achieved with minimal ghost reflections.
Cascading two RWGs enabled similar performance for s-polarized light.
Roll-to-roll fabrication maintained device performance metrics.

Conclusions:

Tailored RWGs offer a promising solution for angularly tolerant, multi-band reflection filters.
These filters are well-suited for AR applications and transparent heads-up displays.
The demonstrated fabrication compatibility supports large-area industrial production.