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Study of optical rotation generated by the twisted nematic liquid crystal film: based on circular birefringence effect

机译：由扭曲向列液晶膜产生的光学旋转：基于圆形双折射效应

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摘要

The optical behavior of twisted nematic liquid crystals (TNLCs) is revealed through an angular scanning technique. Experimental results show that the optical rotation and degree of polarization of transmitted light are dependent on the polarization direction of incident light. The optical rotation is reciprocal, i.e., the polarization direction of incident and transmitted light can reciprocate when optical rotation is pi/2. In some cases, the optical rotation is zero. The orientation of alignment layers in the TN cell can be determined from the behavior of optical rotation, which agrees with the measurement by an atomic force microscope. The experimental results are explained with the model of circularly polarized light based on the circular birefringence effect. Linearly polarized incident light is the super-position of right- and left-handed circularly polarized light. The propagation velocity of circularly polarized light in the LC is relevant to the polarization direction of incident light, so that the refractive indices of left- and right-handed circularly polarized light, n(-) and n(+), or circular birefringence Delta n(= n(- )- n(+)) are not constants. As a result, when a linearly polarized light with the wavelength lambda propagates through a TN cell with the cell gap l, the polarization direction of transmitted light is rotated to an angle Delta theta. The optical rotation Delta theta(= pi(n(-) - n(+))l/lambda) is dependent on the polarization direction of incident light, whereas the averaged refractive index (n) (= (n(-) +n(+))/2) can be independent of that. The incident light is partially linearly polarized light in our experiments, so that the degree of polarization of transmitted light varies with the polarization direction of incident light because the optical rotatory rates for the primary and secondary light beams are different. (C) 2019 Optical Society of America
机译：通过角度扫描技术揭示扭曲向列液晶（TNLC）的光学行为。实验结果表明，透射光的光学旋转和偏振程度取决于入射光的偏振方向。光学旋转是倒数的，即入射的偏振方向和透射光可以在光学旋转是PI / 2时往复运动。在一些情况下，光学旋转为零。可以从光学旋转的行为确定TN电池中的对准层的取向，这与原子力显微镜同意测量。基于圆形双折射效应的圆偏振光模型解释了实验结果。线性偏振的入射光是右手和左手圆偏振光的超位置。 LC中的圆偏振光的传播速度与入射光的偏振方向相关，使得左右圆形偏振光，N（ - ）和n（+）或圆形双折射三角体的折射率n（= n（ - ） - n（+））不是常量。结果，当具有波长λ的线性偏振光通过带电池间隙L的TN电池传播时，透射光的偏振方向旋转到角度Δθ。光学旋转δθ（= PI（n（ - ） - n（+））l / lambda）取决于入射光的偏振方向，而平均折射率（n）（=（n（ - ）+ n （+））/ 2）可以独立于此。在我们的实验中，入射光是部分线性的偏振光，使得透射光的偏振程度随着入射光的偏振方向而变化，因为初级和次级光束的光学旋转速率是不同的。 （c）2019年光学学会

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  • 来源
    《Applied optics》 |2019年第19期|共9页
  • 作者

    Meng Xiangshen; Qiu Xiaoyan; Li Guoqing; Ye Wenjiang; Lin Yueqiang; Liu Xiaodong; Cai Mingle; Wang Xiaoyan; Li Jian; He Zhenghong;

  • 作者单位

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

    Hebei Univ Technol Sch Sci Tianjin 300401 Peoples R China;

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

    Hebei Jiya Elect Co Ltd Shijiazhuang 050071 Hebei Peoples R China;

    Hebei Jiya Elect Co Ltd Shijiazhuang 050071 Hebei Peoples R China;

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

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