Bennis N, Jankowski T, Morawiak P, Spadlo A, Zografopoulos D C, Sánchez-Pena J M, López-Higuera J M, Algorri J F
Opt Express. 2022 Apr 11;30(8):12237-12247. doi: 10.1364/OE.451292.
In this work, a technique to generate aspherical liquid crystal lenses with positive and negative optical power is experimentally demonstrated. The main enabling element is a micro-metric electrode with variable spatial size. This produces a decreasing resistance towards the lens centre that generates the desired voltage/phase profiles. Then, the voltage is homogeneously distributed across the active area of the lens by micro-metric concentric electrodes. As it is demonstrated, the phase shift can be controlled with voltages from 0 to 4.5 V. As a result, parabolic profiles are obtained both for negative and positive optical powers. Furthermore, this approach avoids some disadvantages of previous techniques; parabolic profiles can be obtained with only one lithographic step and one or two voltage sources. Other complex aspherical profiles could be fabricated using the same technique, such as elliptical or hyperbolic ones.
在这项工作中，通过实验证明了一种生成具有正、负光焦度非球面液晶透镜的技术。主要的促成元件是具有可变空间尺寸的微米级电极。这会产生朝向透镜中心逐渐减小的电阻，从而产生所需的电压/相位分布。然后，通过微米级同心电极使电压均匀分布在透镜的有效区域上。如实验所示，相位偏移可通过0至4.5V的电压进行控制。结果，对于负光焦度和正光焦度都能获得抛物线分布。此外，这种方法避免了先前技术的一些缺点；仅通过一步光刻和一两个电压源就能获得抛物线分布。使用相同技术还可以制造其他复杂的非球面分布，例如椭圆形或双曲线形分布。
