A method of achieving homeotropic alignment of liquid crystals (LCs) by ultraviolet light induced phase separation of LC from its mixture with photo-curable pre-polymer is reported. Vertical polymer columns and micro-fibrils developed during the phase separation promote homeotropic alignment of the LC director (i.e., alignment perpendicular to the LC-substrate interface), suitable for devices based on LCs possessing negative dielectric anisotropy. These vertical structures extend between two substrates and permit the fabrication of highly flexible electro-optical devices with high contrast coupled with fast response times. This simple single-step technique eliminates the need for the traditional polymer alignment layer pre-deposited on substrates. (C) 2011 American Institute of Physics. [doi:10.1063/1.3663966]
Applied Physics Letters
Copyright 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 99, 221108 (2011); and may be found at http://dx.doi.org/10.1063/1.3663966.
Acharya, Bharat R.; Choi, Hyunchul; Srinivasarao, Mohan; Kumar, Satyendra (2011). Homeotropically Aligning Phase Separated Columnar Structures For Fabrication of Flexible Electrooptical Devices. Applied Physics Letters 99(22) doi: 10.1063/1.3663966. Retrieved from https://oaks.kent.edu/phypubs/35