Reliable method to characterise parameters and surface effects in wedged and thin liquid crystal cells

Stedman, Ben, Beddoes, Ben, Bankova, Denitsa, Podoliak, Nina, D’Alessandro, Giampaolo, Buchnev, Oleksandr and Kaczmarek, Malgosia (2024) Reliable method to characterise parameters and surface effects in wedged and thin liquid crystal cells. Khoo, Iam Choon (ed.) In Liquid Crystals XXVIII. vol. 13121, SPIE.. (doi:10.1117/12.3029036).

Abstract

Augmented and virtual reality displays require the use of thin liquid crystal cells, with thickness of the order of 1-2 µm. Here, we demonstrate a method, based on cross-polarised intensity measurements coupled to a Frank-Oseen model of the liquid crystal alignment, to characterise such thin cells and the interactions between the liquid crystal and the cell substrates. We first u se w edge s haped c ells t o c alibrate t he m easurement process and show that the cross-polarised intensity data can be used to reliably characterise cells with a non-uniform thickness profile. P reviously, w e h ave s hown t hat w e c an c haracterise o ptically t hin c ells (cells w ith a phase lag of less than 2π). In this report we apply the method to characterise the optical properties of cells with a non-uniform thickness profile a nd g eometrically t hin c ells. W e s how t hat r educing t he t hickness o f t he cell increases the pretilt.

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Contributors

Author: Nina Podoliak

Author: Giampaolo D’Alessandro

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