A Low Voltage Liquid Crystal Phase Grating with Switchable Diffraction Angles.
A Low Voltage Liquid Crystal Phase Grating with Switchable Diffraction Angles.
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DOI：
10.1038/srep39923
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发表时间：
2017-01-05
影响因子：
4.6
通讯作者：
Wu ST
中科院分区：
文献类型：
--
作者：
Chen H;Tan G;Huang Y;Weng Y;Choi TH;Yoon TH;Wu ST
我们展示了一个简单而高性能的相位光栅与可切换的衍射角使用边缘场开关（FFS）液晶（LC）细胞。LC摩擦角平行于FFS电极（即α = 0°），导致在电压开启状态下对称的LC指向矢分布。这种光栅具有三个独特的特点：1）通过控制施加的电压可以形成两个光栅周期，从而产生可切换的衍射角。在我们的设计中，第一衍射级出现在4.3°，而第二衍射级出现在8.6°。2)在λ = 633 nm处，实现第一阶的峰值衍射效率（η~32%）所需的电压仅为4.4 V，而对于其中α为7°的常规基于FFS的相位光栅为70 V，而第二阶（η~27%）为15 V。3）。测量的一阶上升和衰减时间分别为7.62 ms和6.75 ms，二阶上升和衰减时间分别为0.75 ms和3.87 ms。为了理解物理机制，我们还进行了器件模拟。实验与仿真结果吻合较好。
We demonstrate a simple yet high performance phase grating with switchable diffraction angles using a fringe field switching (FFS) liquid crystal (LC) cell. The LC rubbing angle is parallel to the FFS electrodes (i.e. α = 0°), leading to symmetric LC director distribution in a voltage-on state. Such a grating exhibits three unique features: 1) Two grating periods can be formed by controlling the applied voltage, resulting in switchable diffraction angles. In our design, the 1st diffraction order occurs at 4.3°, while the 2nd order appears at 8.6°. 2) The required voltage to achieve peak diffraction efficiency (η~32%) for the 1st order is only 4.4 V at λ = 633 nm as compared to 70 V for a conventional FFS-based phase grating in which α ≈ 7°, while the 2nd order (η~27%) is 15 V. 3). The measured rise and decay time for the 1st order is 7.62 ms and 6.75 ms, and for the 2nd order is 0.75 ms and 3.87 ms, respectively. To understand the physical mechanisms, we also perform device simulations. Good agreement between experiment and simulation is obtained.
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影响因子：
3.8
作者：
Chen, Haiwei;Weng, Yishi;Wu, Shin-Tson
通讯作者：
Wu, Shin-Tson
影响因子：
3.6
作者：
LINDQUIST, RG;KULICK, JH;LESLIE, TM
通讯作者：
LESLIE, TM
影响因子：
3.8
作者：
Xu, Daming;Tan, Guanjun;Wu, Shin-Tson
通讯作者：
Wu, Shin-Tson
具有交替扭曲向列和平面对准区域的液晶光栅的仿真和优化
影响因子：
1.9
作者：
Li, Jia-Nan;Hu, Xi-Kui;Lu, Yan-Qing
通讯作者：
Lu, Yan-Qing
影响因子：
4
作者：
Morris, Stephen M.;Gardiner, Damian J.;Coles, Harry J.
通讯作者：
Coles, Harry J.