Manko Andrey, Kim Young, Morozov Aleksander, Palto Serguei, Won Kanghee, Lee Hong-Seok
Samsung R&D Institute Russia, Office 1500, 12 Bldg.1, Dvintsev Str., 127018 Moscow, Russia.
Advanced Sensor Lab, Device Research Center, Samsung Advanced Institute of Technology, Suwon 437-826, Korea.
Micromachines (Basel). 2022 May 21;13(5):802. doi: 10.3390/mi13050802.
Controlling the phase of light with a high efficiency and precision is essential for applications in imaging, tunable devices, and optical systems. Spatial light modulators (SLMs) based on liquid crystals (LCs) have been regarded as one of the best choices for the generation of phase profiles for the steering of light. The upper glass substrate has an unpatterned electrode for a common electrode, while the lower glass substrate has one-dimensional micro-patterned electrodes for controlling the single pixel level by the applied voltages. By applying different voltages to each electrode to create a sawtooth-shaped phase profile, the collimated input beam is deflected to the desired angle. To maximize the diffraction efficiency (DE) values, an advanced simulation method has been developed to find the optimized phase profile through the analysis of LC director distributions. The resulting diffraction patterns are investigated both computationally and experimentally, with a good agreement between the results obtained. Finally, the beam deflector (BD) system with an advanced driving algorithm has a high 1st order DE, about 60%, 37%, and 7.5% at 1°, 2.5°, and a maximum steering angle of 7.5°, respectively. The LC director distributions in relation to various diffraction angles are simulated and an experimental success in realizing enhanced DE for the beam steering device is presented.
高效且精确地控制光的相位对于成像、可调谐设备和光学系统中的应用至关重要。基于液晶（LC）的空间光调制器（SLM）被视为生成用于光转向的相位分布的最佳选择之一。上玻璃基板有一个用于公共电极的无图案电极，而下玻璃基板有一维微图案电极，用于通过施加的电压控制单个像素级别。通过向每个电极施加不同电压以创建锯齿形相位分布，准直输入光束被偏转到所需角度。为了最大化衍射效率（DE）值，已开发出一种先进的模拟方法，通过分析液晶指向矢分布来找到优化的相位分布。对所得衍射图案进行了计算和实验研究，结果之间具有良好的一致性。最后，具有先进驱动算法的光束偏转器（BD）系统具有较高的一阶DE，在1°、2.5°和最大转向角7.5°时分别约为60%、37%和7.5%。模拟了与各种衍射角相关的液晶指向矢分布，并展示了在实现光束转向装置增强DE方面的实验成功。
