Special topics

    Not found TOPICAL REVIEW — Physical research in liquid crystal


    Default Latest Most Read
    Please wait a minute...
    For selected: Toggle thumbnails
    Kerr effect and Kerr constant enhancement in vertically aligned deformed helix ferroelectric liquid crystals
    Liangyu Shi, Abhishek Kumar Srivastava, Vladimir G Chigrinov, Hoi-Sing Kwok
    Chin. Phys. B, 2016, 25 (9): 094212.   DOI: 10.1088/1674-1056/25/9/094212
    Abstract227)   HTML    PDF (1153KB)(584)      

    In this article, we review recently achieved Kerr effect progress in novel liquid crystal (LC) material: vertically aligned deformed helix ferroelectric liquid crystal (VADHFLC). With an increasing applied electric field, the induced inplane birefringence of LCs shows quadratic nonlinearity. The theoretical calculations and experimental details are illustrated. With an enhanced Kerr constant to 130 nm/V2, this VADHFLC cell can achieve a 2π modulation by a small efficient electric field with a fast response around 100 μs and thus can be employed in both display and photonics devices.

    Research progress of cholesteric liquid crystals with broadband reflection characteristics in application of intelligent optical modulation materials
    Lan-Ying Zhang(张兰英), Yan-Zi Gao(高延子), Ping Song(宋平), Xiao-Juan Wu(武晓娟), Xiao Yuan(苑晓), Bao-Feng He(何宝凤), Xing-Wu Chen(陈兴武), Wang Hu(胡望), Ren-Wei Guo(郭仁炜), Hang-Jun Ding(丁杭军), Jiu-Mei Xiao(肖久梅), Huai Yang(杨槐)
    Chin. Phys. B, 2016, 25 (9): 096101.   DOI: 10.1088/1674-1056/25/9/096101
    Abstract223)   HTML    PDF (7760KB)(1224)      

    Cholesteric liquid crystals (CLCs) have recently sparked an enormous amount of interest in the development of soft matter materials due to their unique ability to self-organize into a helical supra-molecular architecture and their excellent selective reflection of light based on the Bragg relationship. Nowadays, by the virtue of building the self-organized nanostructures with pitch gradient or non-uniform pitch distribution, extensive work has already been performed to obtain CLC films with a broad reflection band. Based on authors' many years' research experience, this critical review systematically summarizes the physical and optical background of the CLCs with broadband reflection characteristics, methods to obtain broadband reflection of CLCs, as well as the application in the field of intelligent optical modulation materials. Combined with the research status and the advantages in the field, the important basic and applied scientific problems in the research direction are also introduced.

    Thermo- and photo-driven soft actuators based on crosslinked liquid crystalline polymers
    Wei Gu(顾伟), Jia Wei(韦嘉), Yanlei Yu(俞燕蕾)
    Chin. Phys. B, 2016, 25 (9): 096103.   DOI: 10.1088/1674-1056/25/9/096103
    Abstract261)   HTML    PDF (10704KB)(505)      

    Crosslinked liquid crystalline polymers (CLCPs) are a type of promising material that possess both the order of liquid crystals and the properties of polymer networks. The anisotropic deformation of the CLCPs takes place when the mesogens experience order to disorder change in response to external stimuli; therefore, they can be utilized to fabricate smart actuators, which have potential applications in artificial muscles, micro-optomechanical systems, optics, and energy-harvesting fields. In this review the recent development of thermo- and photo-driven soft actuators based on the CLCPs are summarized.

    Latest development of display technologies
    Hong-Yue Gao(高洪跃), Qiu-Xiang Yao(姚秋香), Pan Liu(刘攀), Zhi-Qiang Zheng(郑志强), Ji-Cheng Liu(刘吉成), Hua-Dong Zheng(郑华东), Chao Zeng(曾超), Ying-Jie Yu(于瀛洁), Tao Sun(孙涛), Zhen-Xiang Zeng(曾震湘)
    Chin. Phys. B, 2016, 25 (9): 094203.   DOI: 10.1088/1674-1056/25/9/094203
    Abstract299)   HTML    PDF (4928KB)(1459)      

    In this review we will focus on recent progress in the field of two-dimensional (2D) and three-dimensional (3D) display technologies. We present the current display materials and their applications, including organic light-emitting diodes (OLEDs), flexible OLEDs quantum dot light emitting diodes (QLEDs), active-matrix organic light emitting diodes (AMOLEDs), electronic paper (E-paper), curved displays, stereoscopic 3D displays, volumetric 3D displays, light field 3D displays, and holographic 3D displays. Conventional 2D display devices, such as liquid crystal devices (LCDs) often result in ambiguity in high-dimensional data images because of lacking true depth information. This review thus provides a detailed description of 3D display technologies.