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基于液晶光波导的电控偏振旋转器

查正桃 张谦述

查正桃, 张谦述. 基于液晶光波导的电控偏振旋转器[J]. 中国光学(中英文), 2022, 15(3): 552-561. doi: 10.37188/CO.2021-0213
引用本文: 查正桃, 张谦述. 基于液晶光波导的电控偏振旋转器[J]. 中国光学(中英文), 2022, 15(3): 552-561. doi: 10.37188/CO.2021-0213
ZHA Zheng-tao, ZHANG Qian-shu. Electrically controlled polarization rotator based on liquid crystal optical waveguide[J]. Chinese Optics, 2022, 15(3): 552-561. doi: 10.37188/CO.2021-0213
Citation: ZHA Zheng-tao, ZHANG Qian-shu. Electrically controlled polarization rotator based on liquid crystal optical waveguide[J]. Chinese Optics, 2022, 15(3): 552-561. doi: 10.37188/CO.2021-0213

基于液晶光波导的电控偏振旋转器

doi: 10.37188/CO.2021-0213
基金项目: 四川省科技厅科研基金(No. 2014JY0024) ;南充市科技局科研基金(No. 19YFZJ0090);西华师范大学英才科研基金(No. 17YC056)
详细信息
    作者简介:

    查正桃(1997—),男,四川自贡人,2020年于西华师范大学获工学学士学位,在读硕士研究生,主要从事波导光学的理论与技术的研究。E-mail: zaktao@sina.cn

    张谦述(1974—),男,四川自贡人,2010年于电子科技大学获光学工学博士学位,副教授,主要从事光通信与集成光学、微波光子学、集成光波导器件的理论与技术等方面的研究。E-mail: jackyzhang@cwnu.edu.cn

  • 中图分类号: TN252; O753+.2

Electrically controlled polarization rotator based on liquid crystal optical waveguide

Funds: Supported by the Scientific Research Foundation of the Science and Technology Department of Sichuan Province, China (No. 2014JY0024); the Scientific Research Foundation of the Science and Technology Bureau of Nanchong, China (No. 19YFZJ0090); the Talent Scientific Research Foundation of China West Normal University Foundation, China (No. 17YC056)
More Information
  • 摘要: 为了更准确地分析基于液晶光波导的电控偏振旋转器的偏振转换长度和偏振转换效率,研究了向列相液晶场致重新取向的渐变特性。首先,根据液晶磁场耦合方程组得出的本征值方程构建偏振转换长度与外加电压的对应关系。然后通过对电场传输方程进行横向有限差分离散得到了交替方向隐式束传播法迭代方程组的显式表达,用于求解液晶光波导中的传播场,进而计算偏振转换效率。最后,通过仿真实验求解了本征模式以及传播场,进而分析液晶指向矢的渐变特性对偏振转换长度和偏振转换效率的影响。结果表明,液晶指向矢的渐变对偏振转换长度的影响可以忽略,但其得出的最大偏振转换效率相较于液晶重新取向均匀的求解结果低大约20%。这一结果将为基于液晶光波导的电控偏振旋转器的实际开发提供理论参考。

     

  • 图 1  (a)液晶光波导横截面示意图;(b)液晶分子偏转示意图

    Figure 1.  (a) Schematic diagram of the cross-section of liquid crystal optical waveguide; (b) deflection diagram of liquid crystal molecular

    图 2  有限差分法中使用的网格节点示意图。(p, q) 表示中心节点,其余节点为距离其最近的8个节点。${\Delta }x$${\Delta }y$分别表示xy方向上的网格间距

    Figure 2.  Diagram of mesh nodes used in the finite difference method. (p, q) represent the central node, and the other nodes are the 8 nodes closest to the central node. ${\Delta }x$ and ${\Delta }y$ are the mesh spacing in the x and y direction, respectively

    图 3  不同外加电压下$ {\varepsilon _{xx}} $$ {\varepsilon _{yy}} $$ {\varepsilon _{xy}} $(或$ {\varepsilon _{yx}} $)随y的一维渐变曲线

    Figure 3.  One-dimensional gradual change curves of $ {\varepsilon _{xx}} $, $ {\varepsilon _{yy}} $, $ {\varepsilon _{xy}} $ (or $ {\varepsilon _{yx}} $) with y at different applied voltages

    图 4  PCL分别在渐变和均匀两种介电张量下随外加电压变化的曲线

    Figure 4.  PCL varying with applied voltage under gradient and uniform dielectric tensors, respectively

    图 5  初始和输出位置处的电场分布。(a)~(b)初始激励;(c)~(f) 外加电压为1.26倍阈值时输出端的传播场分布;(g)~(j) 外加电压为2.1倍阈值时输出端的传播场分布

    Figure 5.  Electric field distribution at initial and output positions. (a)−(b) Initial excitation; (c)−(f) propagation field distribution at the output when the applied voltage is 1.26 times the threshold; (g)−(j) propagation field distribution at the output when the applied voltage is 2.1 times the threshold

    图 6  外加电压为1.26倍阈值时X截面(a)~(d)和Y截面(e)~(h)的传播场分布

    Figure 6.  When the applied voltage is 1.26 times the threshold, the propagation field distribution of X section (a)−(d) and Y section (e)−(h)

    图 7  外加电压为2.1倍阈值时X截面(a)~(d)和Y截面(e)~(h)的传播场分布

    Figure 7.  When the applied voltage is 2.1 times the threshold, the propagation field distribution of X section (a)−(d) and Y section (e)−(h)

    图 8  PCE随外加电压变化的曲线

    Figure 8.  PCE varying with concerning applied voltage

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出版历程
  • 收稿日期:  2021-12-06
  • 录用日期:  2022-01-21
  • 修回日期:  2021-12-22
  • 网络出版日期:  2022-01-27
  • 刊出日期:  2022-05-20

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