Open AccessReal-time generation of dynamically patterned cholesteric liquid crystal fingerprint textures based on photoconductive effect
Author(s) -
Rong-Guo Jiang,
Weiyi Luo,
YaHao Ge,
Xiaozhong Wang,
Sensen Li,
Lujian Chen
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.011462
Subject(s) - materials science , homeotropic alignment , liquid crystal , optoelectronics , dopant , planar , fingerprint (computing) , optics , liquid crystal display , voltage , photoconductivity , digital light processing , electrode , computer science , doping , computer vision , electrical engineering , computer graphics (images) , physics , projector , engineering , quantum mechanics
We present a convenient approach to facilitate the real-time generation of updatable dynamically patterned cholesteric liquid crystal (CLC) fingerprint textures based on photoconductive effect. The photoconductive Bi 12 SiO 20 (BSO) substrate acts as virtual electrode to obtain the desired states of CLCs by both electric and light fields. Owing to different boundary conditions, the switching of four states; that is, planar, fingerprint, metastable, and homeotropic states, and the rotation of fingerprint stripes can be achieved in planar alignment (PA) cell and hybrid alignment (HA) cell, respectively. With the aid of a digital micro-mirror (DMD)-based exposure system, binary and gray-scale images were successfully written and updated by light upon suitable voltages. This work provides an alternative approach to photoaddress CLC fingerprint patterns, without needing special photoalignment agents or photoresponsitive chiral dopants. We expect that it could be employed in the manipulation of nano/micro-objects by light.