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华东理工大学 理学院, 上海 200237
[ "袁丛龙(1992-), 男, 山东青岛人, 硕士, 从事手性液晶微结构与光学器件的研究。E-mail:conglongyuan@qq.com" ]
[ "郑致刚(1982-), 男, 浙江宁波人, 博士, 华东理工大学物理系教授, 从事液晶光学材料与应用器件的研究。E-mail:zgzheng@ecust.edu.cn" ]
收稿日期:2018-03-07,
录用日期:2018-4-23,
纸质出版日期:2018-07
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袁丛龙, 周康, 王骁乾, 等. 光定域化蓝相软晶格结构的光学应用[J]. 液晶与显示, 2018,33(7):539-547.
Cong-long YUAN, Kang ZHOU, Xiao-qian WANG, et al. Light-patterned blue phase soft cubic superstructure in optical applications[J]. Chinese journal of liquid crystals and displays, 2018, 33(7): 539-547.
袁丛龙, 周康, 王骁乾, 等. 光定域化蓝相软晶格结构的光学应用[J]. 液晶与显示, 2018,33(7):539-547. DOI: 10.3788/YJYXS20183307.0539.
Cong-long YUAN, Kang ZHOU, Xiao-qian WANG, et al. Light-patterned blue phase soft cubic superstructure in optical applications[J]. Chinese journal of liquid crystals and displays, 2018, 33(7): 539-547. DOI: 10.3788/YJYXS20183307.0539.
实验利用表面光取向技术控制蓝相晶格的有序生长,将光定域化取向与分子自组装相结合。通过对基板表面进行交替的取向/非取向控制,平面内获得周期排列的微结构,使蓝相图形化结构的反射光强度在空间上形成周期性调制,同时设计制备了振幅型衍射器件;通过对基板表面做正交取向方向交替排列的微结构,使蓝相图形化结构的反射光相位在空间上形成周期性调制,设计制备了相位型衍射器件。这两类衍射器件均具有对入射光的波段选择性,即只有当入射光的波长局域在蓝相的反射带时才会呈现衍射效应。蓝相液晶软物质的特性又赋予它在电场下可调谐的波段选择性,即反射带位置随电场的增加发生红移从532 nm到610 nm,电场撤除则回复到初始状态。同时,借助于光取向材料的光可擦写特性,蓝相晶格的取向微结构能够重复的擦写与重构,从而实现不同衍射器件乃至不同衍射调制方式的转换。
Combining light-patterning process with self-assembly trait
we applied photo-alignment technique to control the arrangement of liquid crystal blue phase (BP) cubic superstructure. By means of generating alternate aligned areas and non-aligned areas
the amplitude-modulation diffraction devices can be designed
which derives from the periodic reflection intensity of the patterned BP. By means of generating alternate orthogonal alignment directions
the phase-modulation diffraction devices can be designed
which are owing to the periodic reflected phase from the patterned BP. These two types of diffraction devices exhibit peculiarly wavelength-selectivity
which means that light diffraction occurs selectively to certain wavelength. Based on the soft attribute of BP
these devices can respond to applied electric field leading to a tunable wavelength-selectivity. When the external electric field was applied
the corresponding reflection waveband of BP exhibited a continuous red-shifting from 532 nm to 610 nm. Furthermore
a preferable feature of the devices is photo-induced dynamical erasability and rewritability due to rewritable characteristic of the photoalignment film
which results in realizing the conversion of different diffractive devices and even diffractive modulation modes.
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