Variable wide range of lens power and its improvement in a liquid-crystal lens using highly resistive films divided into two regions with different diameters
Variable wide range of lens power and its improvement in a liquid-crystal lens using highly resistive films divided into two regions with different diameters
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DOI：
10.7567/jjap.57.052602
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发表时间：
2018-04
影响因子：
1.5
通讯作者：
M. Kawamura;Susumu Sato
中科院分区：
文献类型：
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作者：
M. Kawamura;Susumu Sato
在理论计算和实验结果的基础上，讨论了液晶透镜在两个电压驱动下的透镜率变化范围。该LC透镜除了具有普通电极外，还具有两个电极，即圆形孔纹电极和圆形电极，以及高阻透明膜。透镜功率的变化范围随着圆形孔纹电极和普通电极上驱动电压的增加而增加，随着高阻薄膜直径的减小而增加。然而，在这些情况下，光学相位延迟分布往往偏离抛物线。作为一种改善折衷性能的方法，将高阻膜分为两个不同直径的区域，其中外膜的方阻大于内膜的方阻。改进后的LC透镜的透镜率可在很大范围内变化，并且具有良好的抛物线相位延迟分布。
The variable range of lens power of a liquid-crystal (LC) lens driven by two voltages is discussed on the basis of calculated and experimental results. The LC lens has two electrodes, which are a circularly hole-patterned electrode and a circular electrode, in addition to a common electrode, and highly resistive transparent films. The variable range of lens power increases with increasing driving voltage applied across the circularly hole-patterned electrode and the common electrode, and with decreasing diameter of highly resistive films. However, the optical-phase retardation profile tends to deviate from a parabolic curve in these cases. As a method to improve the trade-off properties, the highly resistive film is divided into two regions with different diameters, where the sheet resistance of an outer film is larger than that of an inner one. The improved LC lens has a lens power that varies in a wide range, and it exhibits a good parabolic phase retardation profile.