Date
Place
- Room H (Room Hall 1, 1F)
- P1. Poster Session I
- August 20, 2015 (Thursday)
- 14:00 ~ 15:30
- [P1-91]
- 14:00 ~ 15:30
- Title:Photoinduced In-situ Anchoring Transition from Random Planar to Uniform Planar Using Photochromic Azo-Dye in a Nematic Liquid Crystal
- Randhir Kumar Sinha, Sudarshan Kundu, Vineet Kumar, Myong-Hoon Lee, and Shin-Woong Kang (Chonbuk Nat'l Univ., Korea)
Abstract: In this present work, we report the anchoring transition from random planar to uniform planar by controlled illumination of linearly polarized UV-light. A very small amount of liquid crystalline azo-dye (0.1 ~ 0.3 wt%) has been mixed with a nematic liquid crystal of either positive or negative dielectric anisotropy. The ITO (Indium-Thin-Oxide) coated glass cells without any surface pre-treatment have been filled with the liquid crystal mixture. The cells have been exposed to linearly polarized UV-light at an elevated temperature in isotropic phase for 45 minutes at the intensity of 100 ¥ìW/cm2. From optical and electro-optical characterization of the cell, we have confirmed that there is anchoring transition from a random planar to uniform planar. The resulting uniform planar state is stable against heat and visible light treatments. The approach to creating uniform planar alignment by such a non-contact as well as in in-situ condition can be immensely useful for display industry.
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