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Proceedings Paper

Contact-angle measurements as a means of probing the surface alignment characteristics of liquid crystal materials on photoalignment layers
Author(s): K. L. Marshall; O. Didovets; D. Saulnier
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Paper Abstract

The exceptionally high 1054-nm laser-damage resistance of photoalignment materials (approaching that of fused silica) has made it possible to fabricate a wide variety of photoaligned liquid crystal (LC) devices for high-peak-power laser applications. Despite these advances, materials selection and photoalignment exposure conditions are still determined using costly and time-consuming “trial-and-error” methods. The contact angle of a fluid droplet on an alignment layer yields important information about LC-surface physicochemical interactions, and as such, it has potential as a rapid and convenient metric for optimizing photoaligned device quality. To this end, we report on efforts to correlate fluid contact angle with surface energy and azimuthal-anchoring energy to aid in the assessment of alignment quality in photoalignment materials systems.

Paper Details

Date Published: 7 October 2014
PDF: 13 pages
Proc. SPIE 9182, Liquid Crystals XVIII, 91820J (7 October 2014); doi: 10.1117/12.2062074
Show Author Affiliations
K. L. Marshall, Lab. for Laser Energetics, Univ. of Rochester (United States)
O. Didovets, Lab. for Laser Energetics, Univ. of Rochester (United States)
D. Saulnier, Lab. for Laser Energetics, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 9182:
Liquid Crystals XVIII
Iam Choon Khoo, Editor(s)

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