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

Ben Stedman; Ben Beddoes; Denitsa Bankova; Nina Podoliak; Giampaolo D'Alessandro; Oleksandr Buchnev; Malgosia Kaczmarek

doi:10.1117/12.3029036

30 September 2024 Reliable method to characterise parameters and surface effects in wedge and thin liquid crystal cells

Ben Stedman, Ben Beddoes, Denitsa Bankova, Nina Podoliak, Giampaolo D'Alessandro, Oleksandr Buchnev, Malgosia Kaczmarek

Proceedings Volume 13121, Liquid Crystals XXVIII; 131210L (2024) https://doi.org/10.1117/12.3029036
Event: Organic Photonics + Electronics, 2024, San Diego, California, United States

Conference Poster

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 use wedge shaped cells to calibrate the measurement process and show that the cross-polarised intensity data can be used to reliably characterise cells with a non-uniform thickness profile. Previously, we have shown that we can characterise optically thin cells (cells with 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 and geometrically thin cells. We show that reducing the thickness of the cell increases the pretilt.

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

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Ben Stedman, Ben Beddoes, Denitsa Bankova, Nina Podoliak, Giampaolo D'Alessandro, Oleksandr Buchnev, and Malgosia Kaczmarek "Reliable method to characterise parameters and surface effects in wedge and thin liquid crystal cells", Proc. SPIE 13121, Liquid Crystals XXVIII, 131210L (30 September 2024); https://doi.org/10.1117/12.3029036

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