液晶相控阵衍射效率的优化分析  

Optimized Analysis of Diffraction Efficiency for Liquid Crystal Optical Phased Array

作　　者：赵祥杰[1] 刘仓理[1] 张大勇[1] 骆永全[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《光学学报》2013年第11期230-236,共7页Acta Optica Sinica

基　　金：中国工程物理研究院科技发展基金(2012B0401055);流体物理研究所发展基金(SFZ20120304)

摘　　要：衍射效率和扫描范围是影响液晶相控阵实际应用的关键指标,为了实现较大的扫描范围,需要制备高分辨率的液晶相控阵器件,然而在高分辨率下液晶的非线性关联效应会影响其衍射效率,从而限制了其扫描范围。从非线性关联机理出发,数值模拟了明确影响衍射效率的关键因素。通过观察液晶材料参数和器件结构参数对衍射效率的影响,明确优化器件衍射效率的方向。基于优化控制思想,采用优化算法应用合适的电极电压进一步提高器件的衍射效率,减小非线性关联效应的影响,为同时实现较大扫描范围和较高衍射效率的液晶相控阵奠定基础。Diffraction efficiency and scanning range determine the optical performance of liquid crystal optical phased array. To enhance the scanning range, it is necessary to fabricate high spatial resolution device. But due to the limitation of the nonlinear correlation effect, there is a tradeoff between the diffraction efficiency and the scanning range. The key parameters influencing the diffraction efficiency of optical phased array are elucidated based on the mechanism of nonlinear correlation. The effect of the material parameters and device structural parameters on the diffraction efficiency is also investigated, and suggestion is given to enhance the diffraction efficiency. Furthermore, to reduce the effect of nonlinear correlation, optimization method is employed to adapt the voltages applied on each electrode to enhance the diffraction efficiency and proved to be in effect, which will contribute to enlarge the scanning range of optical phased array.

关 键 词：光学器件 液晶相控阵 衍射效率 非线性关联 优化 

分 类 号：O436.1[机械工程—光学工程]