文献类型：期刊文献

英文题名：Light Reconfigurable Topological Optical Phase Structure Enabled by a Photoresponsive Chiral System

作者：Wang, Xiao-Qian[1];Tam, Alwin Ming-Wai[2];Yang, Wei-Qiang[1];Kiselev, Alexei D.[3];Shen, Dong[1];Chigrinov, Vladimir[2];Kwok, Hoi-Sing[2];Li, Quan[4,5,6,7]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]Hong Kong Univ Sci & Technol, State Key Lab Adv Displays & Optoelect Technol, Hong Kong 999077, Peoples R China;[3]St Petersburg Natl Res Univ Informat Technol, Mech & Opt, St Petersburg 197101, Russia;[4]Southeast Univ, Inst Adv Mat, Nanjing 211189, Peoples R China;[5]Southeast Univ, Sch Chem & Chem Engn, Nanjing 211189, Peoples R China;[6]Kent State Univ, Adv Mat & Liquid Crystal Inst, Kent, OH 44242 USA;[7]Kent State Univ, Mat Sci Grad Program, Kent, OH 44242 USA

年份：2023

卷号：11

期号：8

外文期刊名：ADVANCED OPTICAL MATERIALS

收录：;EI(收录号：20231013674866);WOS:【SCI-EXPANDED(收录号:WOS:000939834800001)】；

基金：Acknowledgements X.Q.W. and A.M.W.T. contributed equally to this work. This work was sponsored by the National Natural Science Foundation of China (NSFC) (Nos. 62035008, 11874026, and 61705067), the Jiangsu Innovation Team Program, the Hong Kong Research Grant Council number 16200217, the Fundamental Research Funds for the Central Universities, and the State Key Laboratory of applied optics (No. SKLAO2020 001A07).

语种：英文

外文关键词：all-optical polarization control; geometric phase modulation; light-reconfigurable; chiral liquid crystals; dynamic phase modulation; liquid-crystal-based devices

摘要：The ability to establish significant phase modulation at low applied field provides a promising route toward polarization control and wavefront shaping for liquid-crystal-based devices. Owing to the polarization-selective reflectivity of chiral liquid crystals (CLCs), reflective wavefront shaping via geometric phase is demonstrated when a circularly polarized light is Bragg reflected by a spatially orientated chiral layer. Nowadays, photoresponsive CLCs have attracted extensive attention due to their exotic feature that endows the CLC devices with the capability of electric-free remote control. Despite the mature photoresponsive CLC materials and the sophisticated reflective geometric phase devices, a light-induced topological optical phase modulation for a transmissive wave exiting a CLC cell remains elusive. Here, with the employment of a photosensitive chiral dopant, a hybrid aligned photoresponsive CLC system, demonstrating the simultaneous light modulation of topological geometric phase and dynamic phase via helical pitch manipulation is established. The continuous dual-phase modulation engenders a smooth optically controllable diffraction efficiency (i.e., from 90%) of the proposed light-reconfigurable CLC geometric phase optical element prototypes with multistable diffractive behavior, thus launching a paradigm shift for the application of novel liquid-crystal photonic devices in the field of all-optical polarization and spin processing.