Nanoimprint process to mass manufacture highly-angled high-RI gratings for augmented-reality combiners

Giuseppe Calafiore

doi:10.1117/12.2585973

5 March 2021 Nanoimprint process to mass manufacture highly-angled high-RI gratings for augmented-reality combiners

Giuseppe Calafiore

Proceedings Volume 11703, AI and Optical Data Sciences II; 117030Z (2021) https://doi.org/10.1117/12.2585973
Event: SPIE OPTO, 2021, Online Only

Abstract

Blazed and slanted gratings present particularly interesting optical properties in that they can diffract light predominantly into one side of the diffraction plane (m≤0 or m≥0). This is useful in a variety of applications, especially for AR display combiners, where slanted gratings are commonly used to improve efficiency to the eyebox. Nanoimprint lithography (NIL) has been explored as a route to mass manufacture AR waveguides with slanted structures. However, NIL presents several challenges associated with the process of molding and releasing angled features in a high refractive-index, functional material. In this paper we report a series of breakthroughs achieved at Facebook Reality Labs (FRL) that enable replication of gratings with a slant angle up to 60° and an aspect ratio of 10:1 in a material with refractive index higher than 1.90. To the best of our knowledge, these results are the first public demonstration of highly-slanted gratings imprinted in such a RI material.

Conference Presentation

Citation Download Citation

Giuseppe Calafiore "Nanoimprint process to mass manufacture highly-angled high-RI gratings for augmented-reality combiners", Proc. SPIE 11703, AI and Optical Data Sciences II, 117030Z (5 March 2021); https://doi.org/10.1117/12.2585973

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available