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Three-dimensional control of the helical axis of a chiral nematic liquid crystal by light

机译：通过光对手性向列液晶的螺旋轴进行三维控制

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摘要

Chiral nematic liquid crystals-otherwise referred to as cholesteric liquid crystals (CLCs)-are self-organized helical superstructures that find practical application in, for example, thermography(1), reflective displays(2), tuneable colour filters(3,4) and mirrorless lasing(5,6). Dynamic, remote and three-dimensional control over the helical axis of CLCs is desirable, but challenging(7,8). For example, the orientation of the helical axis relative to the substrate can be changed from perpendicular to parallel by applying an alternating-current electric field(9), by changing the anchoring conditions of the substrate, or by altering the topography of the substrate's surface(10-16); separately, in-plane rotation of the helical axis parallel to the substrate can be driven by a direct-current field(17-19). Here we report three-dimensional manipulation of the helical axis of a CLC, together with inversion of its handedness, achieved solely with a light stimulus. We use this technique to carry out light-activated, wide-area, reversible two-dimensional beam steering-previously accomplished using complex integrated systems(20) and optical phased arrays(21). During the three-dimensional manipulation by light, the helical axis undergoes, in sequence, a reversible transition from perpendicular to parallel, followed by in-plane rotation on the substrate surface. Such reversible manipulation depends on experimental parameters such as cell thickness, surface anchoring condition, and pitch length. Because there is no thermal relaxation, the system can be driven either forwards or backwards from any light-activated intermediate state. We also describe reversible photocontrol between a two-dimensional diffraction state, a one-dimensional diffraction state and a diffraction 'off' state in a bilayer cell.
机译：手性向列液晶（也称为胆甾型液晶（CLC））是自组织的螺旋上层结构，可在例如热成像（1），反射显示器（2），可调滤色镜（3,4）中找到实际应用。和无反光的激光（5,6）。对CLC的螺旋轴进行动态，远程和三维控制是可取的，但具有挑战性（7,8）。例如，可以通过施加交流电场（9），更改基板的锚固条件或更改基板表面的形貌，将螺旋轴相对于基板的方向从垂直更改为平行（10-16）；分别地，平行于基板的螺旋轴的面内旋转可以由直流磁场驱动（17-19）。在这里，我们报告了仅通过光刺激即可实现的CLC螺旋轴的三维操纵，以及其惯用性的反转。我们使用这种技术来进行光激活的，广域的，可逆的二维光束转向，以前是使用复杂的集成系统（20）和光学相控阵（21）完成的。在光的三维操纵过程中，螺旋轴依次经历了从垂直到平行的可逆转变，然后在基板表面上进行了平面内旋转。这种可逆操作取决于实验参数，例如孔的厚度，表面锚定条件和节距长度。由于没有热弛豫，因此可以从任何光激活的中间状态向前或向后驱动系统。我们还描述了双层单元中二维衍射状态，一维衍射状态和衍射“关闭”状态之间的可逆光控。

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  • 来源
    《Nature》 |2016年第7594期|352-356|共5页
  • 作者

    Zheng Zhi-gang; Li Yannian; Bisoyi Hari Krishna; Wang Ling; Bunning Timothy J.; Li Quan;

  • 作者单位

    Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA|Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA;

    Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA|Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA;

    Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA|Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA;

    Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA|Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA;

    US Air Force, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA;

    Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA|Kent State Univ, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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