Effects of the surface relief profile on liquid crystal aligning capabilities of laser-induced periodic surface structures

Jong Jin Lee, Cha Hwan Oh, Geon Joon Lee, Youngpak Lee, Sang Hyon Paek

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The effect of the surface-relief profile on the liquid crystal (LC) alignment was studied using surface-relief gratings (SRGs) that were created on photo-resist (PR) films by holographic lithography. By measuring the anchoring energies of the LC molecules for various surface-relief profiles, we found that the LC molecules on the SRG-patterned PR (SRG-PPR) substrate had a large anchoring energy for a short SRG period and/or a large SRG depth. The anchoring energy of LC molecules on the SRG-PPR substrate was obtained from the analyzer-angle-dependent transmittance of the [Rubbed PI/LC/SRG-PPR] type, 90°-twisted nematic liquid crystal (TNLC) cell prepared using a rubbed polyimide substrate and an SRG-PPR substrate with one of four different SRG periods (or an SRG-PPR substrate with one of three different SRG depths) as the front and the back alignment layers.

Original languageEnglish
Pages (from-to)894-898
Number of pages5
JournalJournal of the Korean Physical Society
Volume49
Issue number3
StatePublished - 2006 Sep 1

Keywords

  • Anchoring energy
  • Liquid crystal alignment
  • Surface relief grating

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