@inproceedings{246c0d5003884563b00926282da9f0f3,
title = "Patterned alignment of liquid crystals",
abstract = "In this study the m-rubbing technique is used to micropattern polyimide alignment layers using a metallic sphere at different loads. Optical and at. force microscopy shows that the width of the patterns ranges from 12-40 mm and depth ranges from 2-14 nm. The authors primary finding is that m-rubbing induces planar alignment in polyimides. The authors performed m-rubbing on pre-rubbed polyimide perpendicular to the rubbing direction. It is found that m-rubbing erases the alignment properties of the pre-rubbing procedure. Liq. crystal cells were constructed using the pre-rubbed polyimide substrates with m-rubbed patterns on one side and a homogeneously rubbed polyimide layer on the other side. Therefore the pre-rubbed polyimide layers are crossed and consequently a twisted nematic alignment is obsd. outside the micro-patterns. Within the micro-patterns, the directions of the pre-rubbing and m-rubbing are parallel, a planar alignment obsd. In another configuration, liq. crystal cells were made with pre-rubbed polyimide substrates having micro-patterns on both sides to give grid pattern with planar and twisted nematic configuration. Studies were extended to det. the pretilt of the micro patterned area.",
author = "S. Varghese and S. Narayanankutty and C.W.M. Bastiaansen and G.P. Crawford and D.J. Broer",
year = "2004",
doi = "10.1117/12.522895",
language = "English",
isbn = "0-8194-5192-4",
series = "Proceedings of SPIE",
publisher = "SPIE",
pages = "206--212",
editor = "L.-C. Chien and M.H. Wu",
booktitle = "Liquid crystal materials, devices, and applications X and projection displays X : 19 - 21 January 2004, San Jose, USA ; proceedings of Electronic imaging, science and technolog",
address = "United States",
note = "Electronic Imaging 2004 ; Conference date: 19-01-2004 Through 21-04-2004",
}