Browsing by Author "Zhu, Ji-Liang"

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Blue Phase LC/Polymer Fresnel Lens Fabricated by Holographics
(2014-02-01)
Tan, Jian
;
Song, Yue
;
Zhu, Ji-Liang
;
Ni, Shui-Bin
;
Wang, Yi-Jun
A novel fabrication method using holographic exposure for switchable blue phase (BP) liquid crystal (LC)/polymer Fresnel lens was demonstrated. The Fresnel pattern can be achieved by interfering a planar and a spherical wave fronts with a 532-nm laser. The BPLC/polymer Fresnel lens can thus be fabricated without photo mask and controlled with a simpler driving compared with the conventional LC Fresnel lens.
Chiral-induced self-assembly sphere phase liquid crystal with fast switching time
(2014-03-03)
Zhu, Ji-Liang
;
Ni, Shui-Bin
;
Chen, Chao Ping
;
Wu, Dong-Qing
;
Song, Xiao-Long
A fluid self-assembly sphere phase (SP) of liquid crystal induced by chiral dopant is observed in a narrow temperature range between isotropic and blue phase or between isotropic and chiral nematic phase. The SP consists of three-dimensional twist spheres (3-DTSs) and disclinations among 3-DTSs. The temperature range of the SP has been broadened to more than 85 degrees C by stabilizing the disclinations with amorphous polymer chains. The electro-optical switching time of the polymer-stabilized SP is demonstrated in sub-millisecond with a low switching electric field of 4.4 V mu m(-1), which is of promising applications in displays, 3-D tunable photonic crystals, and phase modulators. (C) 2014 AIP Publishing LLC.