文献类型：期刊文献

英文题名：Three-dimensionally programmable soft crystals toward geometric phase photonics

作者：He, Fengyin[1];Zhang, Yuxian[2];Liu, Xuan[1];Yuan, Cong-long[1];Hu, Honglong[3];Wang, Xiao-Qian[2];Luo, Duanbin[2];Shen, Dong[2];Zheng, Zhi-Gang[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：12

期号：20

起止页码：7456

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20242016073944);WOS:【SCI-EXPANDED(收录号:WOS:001217330600001)】；

基金：We acknowledge the financial support from the National Key Research and Development Program of China (2022YFA1203700), National Natural Science Foundation of China (grant no. 62005008, 62035008, 61822504, 62275081, 22305079, 52272109), Innovation Program of Shanghai Municipal Education Commission, Scientific Committee of Shanghai (2021-01-07-00-02-E00107), "Shuguang Program" of Shanghai Education Development Foundation and Shanghai Municipal Education Commission (21SG29), China Postdoctoral Science Foundation (2022M721143), Fellowship of China National Postdoctoral Program for Innovative Talents (BX20230125), and Shanghai Sailing Program (23YF1409000). The authors also thank Prof. Masanori Ozaki for valuable discussions about PSBPs under DC electric field, and Dr Hiroyuki Yoshida in Osaka University for the technical assistance in the Kossel diagram simulation.

语种：英文

外文关键词：Crystal orientation - Crystals - Electric fields - Geometry - Liquid crystals - Optical lattices - Optical properties

摘要：Blue phases (BPs), as highly chiral liquid crystalline phases with soft photonic structures, have recently emerged as competitive candidates for advanced optical applications. However, to date, it is still a big challenge to fabricate monodomains of BPs with programmed lattice orientation and manipulate their geometric phase optical properties, especially for BPI with body-centered cubic structures. In this work, we propose an electrically modulated polarization grating based on polymer-stabilized BP (PSBP) monodomains, with each monodomain being composed of BPI crystals with a programmed azimuthal orientation. The in situ experiments reveal that under a biased direct current (DC) electric field, the BPI crystals confined in polymer networks experience a serial 3D lattice deformation that is different from that of pure BPI crystals, which further enables a reversible tuning of the Bragg reflection band of the element over 200 nm in the visible range with a high diffraction efficiency. Our work provides new insights into the future applications of soft crystals in geometric phase optical elements, such as new displays and integrated photonics with 3D tunable optical properties. Patterned monodomains of soft crystals enable programmable tuning in geometric phase photonics, showing prospects for application in flexible electronics and new displays.