Polymerization speed and diffractive experiments in polymer network LC test cells

Larissa Braun; Zhen Gong; Atefeh Habibpourmoghadam; Samuel L. Schafforz; Lukas Wolfram; Alexander Lorenz

doi:10.1117/12.2289725

8 February 2018 Polymerization speed and diffractive experiments in polymer network LC test cells

Larissa Braun, Zhen Gong, Atefeh Habibpourmoghadam, Samuel L. Schafforz, Lukas Wolfram, Alexander Lorenz

Proceedings Volume 10555, Emerging Liquid Crystal Technologies XIII; 105550N (2018) https://doi.org/10.1117/12.2289725
Event: SPIE OPTO, 2018, San Francisco, California, United States

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.

Citation Download Citation

Larissa Braun, Zhen Gong, Atefeh Habibpourmoghadam, Samuel L. Schafforz, Lukas Wolfram, and Alexander Lorenz "Polymerization speed and diffractive experiments in polymer network LC test cells ", Proc. SPIE 10555, Emerging Liquid Crystal Technologies XIII, 105550N (8 February 2018); https://doi.org/10.1117/12.2289725

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