文献类型：期刊文献

英文题名：Switchable Fresnel lens based on hybrid photo-aligned dual frequency nematic liquid crystal

作者：Wang, Xiao-Qian[1,2,3];Yang, Wei-Qiang[1];Liu, Zhen[1];Duan, Wei[2,3];Hu, Wei[2,3];Zheng, Zhi-Gang[1];Shen, Dong[1];Chigrinov, Vladimir G.[4];Kwok, Hoi-Sing[4]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Nanjing Univ, Natl Lab Solid State Microstruct, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China;[3]Nanjing Univ, Coll Engn & Appl Sci, Nanjing 210093, Jiangsu, Peoples R China;[4]Hong Kong Univ Sci & Technol, Dept Elect & Comp Engn, Kowloon, Hong Kong, Peoples R China

年份：2017

卷号：7

期号：1

起止页码：8

外文期刊名：OPTICAL MATERIALS EXPRESS

收录：;EI(收录号：20170103224087);WOS:【SCI-EXPANDED(收录号:WOS:000392205600002)】；

基金：Shanghai Pujiang Program (16PJ1402200); National Natural Science Foundation of China (NSFC) (Grant Nos. 61435008, 61575063); State Key Laboratory on Advanced Displays and Optoelectronics Technologies, ECE Department; CERG (614410, 612409) HKUST, Hong Kong.

语种：英文

外文关键词：Efficiency - Optical instrument lenses - Optical properties - Electric fields - Nematic liquid crystals

摘要：In this article we disclose a method to fabricate a polarization independent dual frequency liquid crystal (DFLC) Fresnel lens (FL) with relatively high efficiency. The switchable FL is based on a patterned hybrid photo-aligned nematic (HPAN) DFLC cell assembled by one substrate providing the homeotropic anchoring and the other one providing the in-plane patterned alignment, with mutually orthogonal easy axis in the neighboring alignment domains, which has been prepared by means of two-step photo-alignment technique. Due to the electro-optical properties of dual frequency LC, the proposed HPAN DFLC FL, which manifests relatively high diffraction efficiency of 38.5% and low driving voltage, has the possibility of achieving a fast response by alternatively switching between high frequency and low frequency electric fields. Thus, with an excellent rewritable performance leading to the alternative focus/defocus switch, the HPAN DFLC FL would definitely be practical and promising in many modern devices. (C) 2016 Optical Society of America