报告题目：Color Tuning in Polymer Stabilized Cholesteric liquid Crystals
报告人：Deng-Ke Yang， Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44236, USA. dyang@kent.edu
报告地点：独墅湖校区907-1549
报告时间：2017年5月12日，下午3点
报告摘要：
Cholesteric liquid crystals consist of chiral elongated molecules and process a helical structure in which the molecules twist spatially around an axis perpendicular to the long molecule axis. They exhibit 1-D photonic bandgap and reflect circularly polarized light. By dispersing a polymer network in the liquid crystal, we developed a polymer stabilized cholesteric liquid crystal whose reflection band can be tuned by applying voltages. In the system ions are trapped on the polymer network. When a voltage is applied, the polymer network moves under electrostatic force. The polymer network has a strong aligning effect on the liquid crystal. The motion of the polymer network compresses the helical pitch of the liquid crystal in the side of the cell close the cathode and stretch the pitch on the other side close to anode. I will theoretically explain the motion of the polymer network and the effect of the polymer network on the helical pitch. I will also discuss the factors that affect the color tuning.
个人简介：
B.S.Physics, Tsinghua University, Beijing, China, 1984.
Ph. D.Physics, University of Hawaii, Honolulu, Hawaii, 1989.
5/04-Professor, Chemical Physics Program, Kent State University, Kent, Ohio.
5/1999-5/04Associate Professor, Chemical Physics Program, Kent State University,Kent, Ohio.
8/95-5/99Assistant Professor, Chemical Physics Program, Kent State University,Kent, Ohio.
10/92-7/95Senior Research Fellow, Liquid Crystal Institute, Kent State University, Kent, Ohio.
10/91-9/92Research Fellow, Liquid Crystal Institute, Kent State University, Kent,Ohio.
9/89-9/91Postdoctoral Fellow, Liquid Crystal Institute, Kent State University, Kent,Ohio.
研究领域：Liquid Crystal and Polymer Physics, Liquid Crystal Displays.
获奖情况：
Kent State University Excellence award in invention
For invention of bistable reflective cholesteric liquid crystal display and polymer stabilized liquid crystal devices, 2000.
Information Display Society Special Recognition Award
For pioneering work on polymer stabilized devices and reflective displays, 2005.
Information Display Society Fellow
For significant scientific and technological contributions to bistable, reflective cholesteric displays and to polymer-stabilized cholesteric devices, and for his outstanding contributions to education in the field of liquid crystal technology, 2007.
Information Display Society, Slottow-Owaki Prize, 2017
For contributions to the education and training of students and professionals in the field of liquid-crystal displays.
Outstanding research and scholarship award, Kent State University, 2017.
（报告联系人：张正彪老师）