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Wolfer, Pascal ; Kreger, Klaus ; Schmidt, Hans-Werner ; Stingelin, Natalie ; Smith, Paul:
Photo-Oriented Trisazobenzene Layers for Patterned Liquid-Crystal Alignment.
In: Molecular Crystals and Liquid Crystals.
Bd. 562
(2012)
Heft 1
.
- S. 133-140.
ISSN 1563-5287
DOI: https://doi.org/10.1080/15421406.2012.674857
Abstract
Photosensitive trisazobenzene-based layers, after irradiation with polarized light, are employed to align the common liquid-crystal (LC) compound 4-cyano-4′-heptylbiphenyl (7CB) into predetermined patterns. Surface analysis of the trisazobenzene films indicate that ordering of the LC material is not caused by illumination-induced surface relief structures, but through "molecular mesoepitaxial" phenomena. This finding can be exploited to produce in one-step in-plane patterns of randomly oriented and ordered macroscopic LC domains by irradiation of the substrates.