Highly efficient twisted nematic liquid crystal polarization gratings achieved by microrubbing
Highly efficient twisted nematic liquid crystal polarization gratings achieved by microrubbing
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DOI：
10.1063/1.4737945
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发表时间：
2012-07-23
影响因子：
4
通讯作者：
Nose, T.
中科院分区：
文献类型：
--
作者：
Honma, M.;Nose, T.
我们展示了具有高一阶衍射效率（>90%）的扭曲向列液晶（LC）偏振光栅（tnpg），其扭曲角为常数，而中平面液晶定向器的方位角在空间上呈线性变化。采用琼斯矩阵法推导了高衍射效率的设计方案。对于延迟等于(n+1/2) λ （n为整数，λ为波长）的厚LC层，设计的一阶衍射效率理论上达到100%。我们还提出了一个简单的模型，用于tnpg中光栅周期和扭转角依赖于Freedericksz跃迁的阈值电压。(C) 2012年美国物理研究所。[http://dx.doi.org/10.1063/1.4737945]
We demonstrate twisted nematic liquid crystal (LC) polarization gratings (TNPGs) with a high first-order diffraction efficiency (>90%) that have the twist angle as constant, whereas the azimuthal angle of the mid-plane liquid-crystal director varies linearly in space. The high diffraction-efficiency design scheme is derived by means of the Jones matrix method. The designed first-order diffraction efficiency theoretically reaches 100% for the thick LC layer in which the retardation equals (n+1/2)lambda (n is an integer and lambda is the wavelength). We also present a simple model for the grating period-and twist angle-dependent threshold voltage of the Freedericksz transition in TNPGs. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737945]