Pretilt angle of liquid crystals on polyimide films photo-aligned by single oblique angle irradiation with un-polarized light

Kenji Sakamoto, Kiyoaki Usami, Toru Sasaki, Yoichi Uehara, Sukekatsu Ushioda

研究成果: Article査読

14 被引用数 (Scopus)

抄録

We have investigated the pretilt angle of liquid crystal (LC) molecules induced by photo-aligned films of polyimide containing azobenzene in the backbone structure (Azo-PI). The photo-alignment treatment was single oblique-angle irradiation with un-polarized light (UP-L) at an incidence angle of 45°. It was performed on films of polyamic acid (Azo-PAA) using a light source of wavelength 340-500 nm. The photo-treated films of Azo-PAA were converted into Azo-PI by thermal imidization. The pretilt angle of LC molecules was determined by a crystal rotation method. The pretilt angle increased with the UP-L exposure, reaching ∼3° at 880J/cm2. For UP-L exposures above 440J/cm2 the LC alignment was uniform and defect-free, while marbled textures were observed below 220J/cm2, This is due to the small in-plane anisotropy of the photo-aligned Azo-PI films.

本文言語English
ページ(範囲)2705-2707
ページ数3
ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
45
4 A
DOI
出版ステータスPublished - 2006 4 7

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

フィンガープリント

「Pretilt angle of liquid crystals on polyimide films photo-aligned by single oblique angle irradiation with un-polarized light」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル