学术报告（7月22日 10:00-12:00）

主持人：周建英 教授

欢迎广大师生前来参与！

【摘要】

Incorporation of liquid crystal (LC) as a defect layer in a photonic crystal (PC) permits the electrically tunable transmission spectrum of defect modes within the photonic bandgap. This tunability makes such a hybrid structure potentially beneficial for designing various types of optical devices. Several distinctive photonic bandgap structures based on one-dimensional (1-D), multi-layered PCs containing memory-incapable or memory-enabling LC as a defect layer have been proposed by professor LEE. The optical state remains unchanged after removal of applied voltage in the memory state. Owing to the wavelength tunability, amplitude tunability and optical multistability of the defect modes, these 1-D hybrid structures are intriguing for photonic device applications such as low-power-consumption multichannel filters, light shutters and electrically controllable intensity modulators without the need of any polarizers.

And the development of various PC/LC structures for photonic applications will be presented. Special attention will be paid to lasing from 1-D photonic bandgap structures comprising dye-doped LCs. An asymmetric photonic bandgap structure will be explored in a case study where dye-doped nematic LC is employed to generate ultralow-threshold, single-mode lasing. Moreover, I shall highlight color-switchable and white-light laser devices along this line using dye-doped cholesteric LC confined in a photonic bandgap structure with an unconventional design for the dielectric mirrors.

【报告人简介】

Wei Lee received his M.S. degree in electro-optical engineering from National Chiao Tung University (NCTU), Taiwan, in 1987 and Ph.D. degree in physics from the University of Alabama at Birmingham (UAB), AL, in 1993. He was a lecturer at UAB between 1993 and 1994 and a full-time visiting assistant professor of physics and astronomy at the University of Toledo, OH, between 1994 and 1997. From August 1997 through January 2012, Dr. Lee was affiliated with the Department of Physics, Chung Yuan Christian University, Taiwan. He took his sabbatical leave as a visiting professor of optics at CREOL of the University of Central Florida, FL, during the academic year of 2009–2010, and was a visiting scholar at the L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Russia in 2010, 2015 and 2018. Prof. Lee was the Director of the Institute of Imaging and Biomedical Photonics, College of Photonics, NCTU (Tainan Campus), between March 2012 and July 2015. He served on the editorial board of the OSA journal Optical Materials Express as a founding editor for two terms from 2011 through 2016. He was the President of Taiwan Liquid Crystal Society for two terms between 2014 and 2017 and an executive committee member—Optical Groups Liaison—of the Optical Materials Study Group, the Optical Society (OSA), from 2015 till 2017. He served as the Conference Chair of the 3rd Asian Conference on Liquid Crystals (ACLC 2017) held in Tainan, Taiwan, and General Chair of the 102nd annual meeting of OSA (FiO/LS 2018) held in Washington, D.C. Dr. Lee is currently a board member of the International Liquid Crystal Society and has worked in the research areas of liquid-crystal (LC) optics, structural vibration analysis, laboratory astrophysics, physics education, and pedagogy of English for science and technology for non-native speakers since 1985. Prof. Lee has been a reviewer for 89 different academic journals. His recent research interests focus on LC photonic and dielectric properties, photonic crystals, plasmonics, and LC-based biosensing.