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弱锚泊对液晶微波相位调制的影响

叶文江 王梦莹 邢红玉 安亚帅 秦相磊

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弱锚泊对液晶微波相位调制的影响

叶文江, 王梦莹, 邢红玉, 安亚帅, 秦相磊

Influence of weak anchoring on the microwave phase modulation of liquid crystals

Ye Wen-Jiang, Wang Meng-Ying, Xing Hong-Yu, An Ya-Shuai, Qin Xiang-Lei
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  • 液晶对微波的调制取决于外加电压作用下液晶分子的取向, 而基板的锚泊对液晶取向有重要影响, 必然导致微波调制的变化. 本文研究了无手性掺杂的弱锚泊90扭曲向列相液晶的微波调制特性. 基于液晶弹性理论和变分原理得到了液晶盒系统的平衡态方程和边界条件, 采用差分迭代方法数值模拟了不同锚定强度大小和不同预倾角下单位长度相移随电压的变化. 结果表明: 1)预倾角对微波相移的影响与施加电压有关. 当液晶盒施加电压为0.51.6 V之间时, 随预倾角增大, 单位长度微波相移及其与强锚泊0预倾角90扭曲液晶相移差均增大, 且相移差达到最大时的电压值也随倾角增大而减小; 1.63.0 V之间, 单位长度微波相移及相移差随预倾角增大而减小; 1.6 V附近及3.0 V之后, 相移基本没有变化. 2)表面锚定强度大小对微波相移的影响非常大. 随锚定强度减小, 单位长度微波相移及相移差均会增大, 微波相移的可调范围也增大, 且增加越来越明显. 此研究为液晶微波调制器件的设计提供了理论依据.
    The microwave modulation induced by liquid crystals is determined by the orientation of liquid crystal molecules under an external applied voltage. The anchoring of substrate has an important effect on the liquid crystal orientation, which results in the change of microwave modulation. In this paper, the microwave modulation property of 90 twisted nematic liquid crystals with weak anchoring without chiral dopant is studied. Based on the elastic theory of liquid crystals and the variational theory, the equations of equilibrium state and the boundary condition are given, and the variations of phase-shift per unit-length with voltage for different anchoring energy coefficients and pre-tilt angles are also simulated using the finite-difference iterative method. Results are as follows: (1) The influence of pre-tilt angle on microwave phase-shift is related to the applied voltage. When the voltage applied to the liquid crystal cell is from 0.5 to 1.6 V, with increasing pre-tilt angle, the microwave phase-shift per unit-length and the phase-shift difference relative to the strong anchoring 90 twisted nematic liquid crystal with pre-tilt angle 0 will all increase, and the applied voltage for the maximum phase-shift difference decreases. When the applied voltages are from 1.6 to 3.0 V, the microwave phase-shift per unit-length and the phase-shift difference all decrease with increasing pre-tilt angle. When the applied voltages are near 1.6 V or larger than 3.0 V, the phase-shift per unit-length has little change. (2) The anchoring energy strength has a great influence on microwave phase-shift. As the anchoring strength decreases, the microwave phase shift per unit-length and the phase-shift difference will increase, also the tunable range of microwave phase-shift increases more and more obviously. This research provides a theoretical foundation for the design of the liquid crystal modulator.
      通信作者: 邢红玉, hongyu_xing@163.com
    • 基金项目: 国家自然科学基金(批准号: 11374087, 11304074, 11447179)、河北省自然科学基金(批准号: A2014202123, A2015202343)、河北省教育厅项目(批准号: QN2014130), 河北省高校重点学科和大学生创新创业训练计划(批准号: 201410080001)资助的课题.
      Corresponding author: Xing Hong-Yu, hongyu_xing@163.com
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11374087, 11304074, 11447179), the Natural Science Foundation of Hebei Province, China (Grant Nos. A2014202123, A2015202343), the Research Project of Hebei Education Department, China (Grant No. QN2014130), the Key Subject Construction Project of Hebei Provincial University, and the Undergraduate Innovation and Entrepreneurship Training Program, China (Grant No. 201410080001).
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    Lim K C, Margerum J D, Lackner A M, Sherman E, Smith W H 1993 Liq. Cryst. 14 327

    [3]

    Nguyen T, Umeno S, Higuchi H, Kikuchi H, Moritake H 2014 Jpn. J. Appl. Phys. 53 01AE08

    [4]

    Fujikake H, Kuki T, Nomoto T, Tsuchiya Y, Utsumi Y 2001 J. Appl. Phys. 89 5295

    [5]

    Lim K C, Margerum J D, Lackner A M 1993 Appl. Phys. Lett. 62 1065

    [6]

    Tanaka M, Nose T, Sato S 2000 Jpn. J. Appl. Phys. 39 6393

    [7]

    Dolfi D, Labeyrie M, Joffre P, Huignard J P 1993 Electron. Lett. 29 926

    [8]

    Mller S, Scheele P, Weil C, Wittek M, Hock C, Jakoby R 2004 IEEE MTT-S Digest 1153

    [9]

    Garbovskiy Yu, Zagorodnii V, Krivosik P, Lovejoy J, Camley R E, Celinski Z, Glushchenko A, Dziaduszek J, Dbrowski R 2012 J. Appl. Phys. 111 054504

    [10]

    Yang F Z, Sambles J R 2001 Appl. Phys. Lett. 79 3717

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    Yang F Z, Sambles J R 2004 Appl. Phys. Lett. 85 2041

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    Karwin C M, Livesey K L 2013 Appl. Phys. Lett. 103 063508

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    Karwin C K, Livesey K L 2014 Liq. Cyrst. 41 707

    [14]

    Ye W J, Xing H Y, Zhou X, Sun Y B, Zhang Z Z 2015 AIP Adv. 5 067145

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    Yang D K, Wu S T 2006 Fundamentals of Liquid Crystal Devices (Chichester: John Wiley Sons Ltd pp127-130)

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    Wang Q, He S L 2001 Acta Phys. Sin. 50 926(in Chinese) [王谦, 何赛灵 2001 物理学报 50 926]

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    Zhang Z Z, Ye W J, Xing H Y 2004 Chinese J. Comput. Phys. 21 156 (in Chinese) [张志东, 叶文江, 邢红玉 2004 计算物理 21 156]

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    Bulja S, Mirshekar-Syahkal D, James R, Day S E, Fernndez F A 2010 IEEE Trans. Microwave Theory Tech. 58 3493

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出版历程
  • 收稿日期:  2015-03-15
  • 修回日期:  2015-05-15
  • 刊出日期:  2015-10-05

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