Tunable pretilt angles based on nanoparticles-doped planar liquid-crystal cells

Jeng, S-Chang.; Hwang, S-June.; Yang, C-Yu.; Jeng, S-Chang; Hwang, S-June; Yang, C-Yu

doi:10.1364/ol.34.000455

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Tunable pretilt angles based on nanoparticles-doped planar liquid-crystal cells

Jeng, S-Chang.; Hwang, S-June.; Yang, C-Yu.

Optics Letters 34(4): 455-457

2009

ISSN/ISBN: 0146-9592

PMID: 19373339

DOI: 10.1364/ol.34.000455
Accession: 056708390

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Summary

The nanoparticles-induced vertical alignment technique was applied to generate variable liquid-crystal pretilt angles based on doping different concentrations of polyhedral oligomeric silsesquioxane (POSS) nanoparticles in the planar-aligned liquid crystal cells. Competition between the homogeneously aligned polyimide layer and POSS-induced spontaneous vertical alignment domain generated the variable pretilt angle. Experimental results demonstrated that the pretilt angle theta(p) is a function of the doped POSS concentration and can be controlled continuously over the range of 0 degrees <theta(p)<90 degrees .