The oldest and most proven technique for fabricating diffraction gratings is mechanical ruling, which has been used for mass market manufacturing since the early 1960's. In this talk I will give the latest update on Inprentus' use of contact‐mode lithography for fabricating aperiodic grating‐coupled waveguides for AR. I will show data demonstrating 20‐picometer pitch uniformity, low stray light levels, aperiodic modulation results, and successful replication in a high‐index (n=1.9) resin using commercially available nanoimprint lithography.
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Abbamonte et al. (2024) studied this question.
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