第一场报告：10月12号（周一）上午9:00-11:00

地点：澳门太阳娱乐网站官网1号楼210会议室

 

题目：Topology-mediated optical and electro-optical properties of chiral nematic systems

报告人：Prof. CHIEN, LIANG-CHY

Kent State University, Chemical Physcis and Liquid Crystal Instituten

Abstract: We demonstrate electrical and photo control of the transmittance of the self-assembled bubble domain (BD) texture of cholesteric liquid crystals (CLC) with negative dielectric anisotropy confined into a cell with homeotropic surface anchoring. By using a photosensitive chiral dopant with variable helical twisting power under light irradiation, control of packing density of bubbles, spatial patterning, as well as all-optical switching between bistable states with different optical densities is achieved By introducing dichroic dye into the CLC mixture, a bistable and switchable by applied electric field guest-host system is obtained. The light dimming properties of dye-doped BD CLC systems may lead to development of a wide range of applications.

 

 

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第二场报告：10月13号（周二）下午3:00-5:00

地点：澳门太阳娱乐网站官网力学楼434会议室

题目：Topology-mediated flexoelectro-optical behavior of chiral nematic systems

Abstract: We explore flexoelectro-optic effect in polymer stabilized uniform lying helix cholesteric liquid crystal texture samples. A method to enlarge the flexoelectric response of CLC mixture is demonstrated by mixing two LC host materials with larger and smaller effective flexoelastic coefficients. By optimization of material composition of CLC mixture a large angle of flexoelectrically driven in-plane rotation of helical axis with a submillisecond response time are obtained. Our findings will be useful for material design of future CLC mixtures for applications in flexoelectrooptic displays.

 

报告人简介

Liang-Chy Chien, Ph.D., professor and ex-director of the Chemical Physics Interdisciplinary Program, Liquid Crystal Institute, Kent State University. He holds appointments as a visiting professor at the Philips Research Laboratories in Eindhoven, Netherlands (2003) and College of Engineering at Stanford University, Palo Alto, CA (2015).  Dr. Chien is an inventor/co-inventor of many non-contact liquid crystal alignment polymer stabilized liquid crystal technologies for spatial light modulators and cholesteric displays.  He has authored 15 proceedings, several book chapters, and a contracted book on liquid crystal displays in progress.  He has published 150 referred articles, 150 of juried scientific proceedings and digests articles.  He has 26 issued and commercialized and 19 pending patents on liquid crystal materials, devices and flexible displays. Dr. Chien is a fellow of SPIE, and is an associate editor of Applied Optics, Crystals, Molecular Crystals and Liquid Crystals, and IEEE/LEOS Journal of Display Technologies. He gave over 180 plenary and invited talks and has served as a conference organizer or session chair of many professional society meetings including SPIE, Photonics West (1997-2016), 1999 MRS, 2011 Gordon Research Conference on Liquid Crystals and 2013 Optics of Liquid Crystals. He will co-chair the 2016 MRS Spring Meeting in Phoenix, AZ.

 

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