Anomalous uniform domain in a twisted nematic cell constructed from micropatterned surfaces

TL;DR

This paper reports the discovery of an optically uniform anomalous domain in twisted nematic cells with micropatterned substrates, driven by elastic anisotropy rather than traditional anchoring methods.

Contribution

It introduces a new type of uniform domain in TN cells created by micropatterned surfaces and provides a model predicting their stability based on material and design parameters.

Findings

Anomalous uniform domain occurs only in micropatterned TN cells.

Elastic anisotropy can replace conventional rubbing for anchoring.

Model predicts stability regions for different states.

Abstract

We have discovered an optically uniform type of domain that occurs in Twisted Nematic (TN) cells that are constructed from substrates chemically patterned with stripes via microcontact printing of Self-Assembled Monolayers (SAM); such domains do not occur in TN cells constructed from uniform substrates. In such a cell, the azimuthal anchoring at the substrates is due to the elastic anisotropy of the liquid crystal rather than the conventional rubbing mechanism. A model is presented that predicts the relative stability of the twisted and anomalous states as a function of the material and design parameters.