NEW METHOD FOR MOLECULAR ORIENTATION OF LIQUID CRYSTALS: PHOTOLITHOGRAPHY

Yıl 2016, Cilt: 12 Sayı: 2, 7 - 7, 01.08.2016

Suleyman Yılmaz

Öz

In this study, photolithography was applied on molecular alignment of Liquid Crystals
(LCs) as a new method outside of conventional molecular orientation. Planar and homeotropic
orientation were studied for the molecular orientation. In the photolithography, coating polyimide,
UV exposing, chemical etching and curing process were applied to provide micro-grooving surface,
respectively. Three type LC cells were made by provided rubbing and photolithography for planar
alignment and also homeotropic alignment.
Electro-optical properties of the liquid crystal were examined under the electric field at phase
transition region for three type LC Cells at the fixed temperature points, 300 K, 315K, and 325 K.
Experimental setups was adjusted to measure optical transitions with thermal, electric and optic units.
The photolithographic method was found more effective and acceptable than the other conventional
methods for molecular orientation. It was also observed that the molecular anisotropy and surface
anchoring of liquid crystal was affected considerably by the applied electric field.

Anahtar Kelimeler

Liquid Crystals, Polyimide Coating, Photolithography, Electro-Optical Properties