Azimuthal and polar anchoring energies of aligning layers structured by nonlinear laser lithography

In spite of the fact that there are different techniques in the creation of the high-quality liquid crystals (LCs) alignment by means of various surfaces, the azimuthal and polar anchoring energies as well as the pre-tilt angle are important parameters to all of them. Here, the modified by a certain...

Full description

Saved in:
Bibliographic Details
Published in:Liquid crystals 2021-01, Vol.48 (1), p.131-149
Main Authors: Pavlov, I., Candemir, O., Rybak, A., Dobrovolskiy, A., Kadan, V., Blonskiy, I., Lytvyn, P., Korchovyi, A., Tytarenko, P., Kazantseva, Z., Gvozdovskyy, I.
Format: Article
Language:English
Subjects:
Aligning layers
Alignment
Attitude (inclination)
azimuthal anchoring energy
Contact angle
Creagh-Kmetz's rule
Crystals
Grooves
Laser processing
Lasers
Liquid crystals
Lithography
nano-structured titanium layers
nematic liquid crystals
nonlinear laser lithography
Parameter modification
polar anchoring energy
Scanning
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In spite of the fact that there are different techniques in the creation of the high-quality liquid crystals (LCs) alignment by means of various surfaces, the azimuthal and polar anchoring energies as well as the pre-tilt angle are important parameters to all of them. Here, the modified by a certain manner aligning layers, previously formed by nonlinear laser lithography (NLL), having high-quality nano-periodic grooves on Ti surfaces, recently proposed for LC alignment was studied. The change of the scanning speed of NLL in the process of nano-structured Ti surfaces and their further modification by means of ITO-coating, and deposition of polyimide film has enabled different aligning layers, whose main characteristics, namely azimuthal and polar anchoring energies, were measured. For the modified aligning layers, the dependencies of the twist and pre-tilt angles for LC cells filled by nematic E7 (Δε > 0) and MLC-6609 (Δε < 0) were obtained. Also, the contact angle for droplets of isotropic liquid (glycerol), and nematic LCs was measured for the various values of the scanning speed during the laser processing.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2020.1766589