Photopolymer material durability and safety in holographic diffusers for visual applications

Matthew Hellis; Alan Casey; Edoardo Splendi; Suzanne Martin; Matthew Sheehan; Kevin Murphy

doi:10.1117/12.3016945

18 June 2024 Photopolymer material durability and safety in holographic diffusers for visual applications

Matthew Hellis, Alan Casey, Edoardo Splendi, Suzanne Martin, Matthew Sheehan, Kevin Murphy

Proceedings Volume 13015, Photosensitive Materials and their Applications III; 130150T (2024) https://doi.org/10.1117/12.3016945
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

This study introduces novel holographic diffuser applications employing acrylamide- or diacetone acrylamide-based photopolymers, patterned within the volume on a micron scale by a single-beam holographic recording process. These diffusers have previously been presented as potential treatments for amblyopia and diplopia. This work has now been extended to spectrometric analysis to determine their properties under broadband light. Diffusive elements with higher diffusion efficiencies exhibited a marginal reduction (< 5%) in diffusion efficiency across most of the visible spectrum. Given the intended application of these holographic diffusers, cytotoxicity assessments were also performed. This is significant as there is a difference in toxicity between the crystalline acrylamide (classified as a category 3 material) and diacetone acrylamide (classified as a category 4 material). The findings indicated substantially lower toxicity in holograms produced with diacetone acrylamide-based photopolymer. The accelerated ageing of both formulations of holographic diffusers indicated that the acrylamide-based holographic diffusers did not reduce efficacy in the 292 days of ageing. The diacetone acrylamide-based holographic diffusers exhibited reduced efficacy by day 182. Despite this, both formulations have been shown to perform for prolonged periods as the treatment modality would require. These results emphasise that holographic diffusers exhibit minimal spectral impact, and longevity on the scale of treatment regimes which are crucial considerations for their prospective use case as treatments for amblyopia and diplopia.

Conference Presentation

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

Citation Download Citation

Matthew Hellis, Alan Casey, Edoardo Splendi, Suzanne Martin, Matthew Sheehan, and Kevin Murphy "Photopolymer material durability and safety in holographic diffusers for visual applications", Proc. SPIE 13015, Photosensitive Materials and their Applications III, 130150T (18 June 2024); https://doi.org/10.1117/12.3016945

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