Durability evaluation of repeated imprint using working stamp: influence of productivity for diffractive optical elements

Taigo Akasaki; Risa Tanaka; Takeshi Osaki

doi:10.1117/12.3004959

12 March 2024 Durability evaluation of repeated imprint using working stamp: influence of productivity for diffractive optical elements

Taigo Akasaki, Risa Tanaka, Takeshi Osaki

Author Affiliations +

Proceedings Volume 12913, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) V; 129130V (2024) https://doi.org/10.1117/12.3004959
Event: SPIE AR | VR | MR, 2024, San Francisco, California, United States

Abstract

The productivity of waveguide combiner is crucial for augmented reality (AR) devices. Nanoimprint technology is one of options to produce Surface Relief Grating (SRG) waveguides today. This technology enables fabricating SRG patterns by pressing a mold with the desired SRG patterns into High Refractive Index (HRI) resins, and UV curing, then released the mold from HRI resins. The mold used in this process is known as a master mold, and these master molds are expensive to be used as stamps for production itself directly. Working stamps made by resins, a copy of the master molds, are used repeatedly to prevent damage to the master molds and reduce process costs. In this method, high durability is desirable for the working stamp over repeated cycles. We evaluated the formability and durability of working stamps through repeated using that influences the productivity of SRG waveguides. In this process, we investigated the compatibility between HRI resins (RI = 1.8 and RI = 1.9 respectively) and working stamps by fabricating grating patterns 50 times repeatedly to examine the influence of the material types on the durability of working stamps. The result showed that there are no defects and significant deformation on the patterns of each HRI resins after fabricated repeatedly more than 50 times using one working stamp respectively. This suggests that working stamps have capability to improve the productivity of SRG waveguides.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Taigo Akasaki, Risa Tanaka, and Takeshi Osaki "Durability evaluation of repeated imprint using working stamp: influence of productivity for diffractive optical elements", Proc. SPIE 12913, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) V, 129130V (12 March 2024); https://doi.org/10.1117/12.3004959

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