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Proceedings Paper

Polymerization speed and diffractive experiments in polymer network LC test cells
Author(s): Larissa Braun; Zhen Gong; Atefeh Habibpourmoghadam; Samuel L. Schafforz; Lukas Wolfram; Alexander Lorenz
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Paper Abstract

Polymer-network liquid crystals (LCs), where the response properties of a LC can be enhanced by the presence of a porous polymer network, are investigated. In the reported experiments, liquid crystals were doped with a small amount (< 10%) of photo-curable acrylate monomers. Samples with surface grafted photoinitiators, dissolvable photoinitiators, and samples with both kinds of photoinitiators were prepared. Both conventional (planar electrodes) and diffractive (interdigitated electrodes) test cells were used. These samples were exposed with a UV light source and changes of their capacitance were investigated with an LCR meter during exposure. Due to the presence of the in-situ generated polymer network, the electro-optic response properties of photo cured samples were enhanced. For example, their continuous phase modulation properties led to more localized responses in samples with interdigitated electrodes, which caused suppression of selected diffraction orders in the diffraction patterns recorded in polymer network LC samples. Moreover, capacitance changes were investigated during photopolymerization of a blue phase LC.

Paper Details

Date Published: 8 February 2018
PDF: 10 pages
Proc. SPIE 10555, Emerging Liquid Crystal Technologies XIII, 105550N (8 February 2018); doi: 10.1117/12.2289725
Show Author Affiliations
Larissa Braun, TU Darmstadt (Germany)
Zhen Gong, Paderborn Univ. (Germany)
Atefeh Habibpourmoghadam, Paderborn Univ. (Germany)
Samuel L. Schafforz, Paderborn Univ. (Germany)
Lukas Wolfram, Univ. of Kassel (Germany)
Alexander Lorenz, Paderborn Univ. (Germany)
Univ. of Kassel (Germany)

Published in SPIE Proceedings Vol. 10555:
Emerging Liquid Crystal Technologies XIII
Liang-Chy Chien, Editor(s)

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