Opt Express. 2023 May 8;31(10):15523-15536. doi: 10.1364/OE.488844.
A liquid crystal (LC) lens with a laterally shiftable optical axis is proposed and demonstrated. The optical axis of the lens can be driven to shift within the lens aperture without compromising its optical properties. The lens is constructed by two glass substrates with identical interdigitated comb-type finger electrodes on the inner surfaces, and they are oriented at 90° with respect to each other. The distribution of voltage difference between two substrates is determined by eight driving voltages, and is controlled within the linear response region of LC materials, thereby generating a parabolic phase profile. In experiments, an LC lens with an LC layer of 50 µm and an aperture of 2 mm × 2 mm is prepared. The interference fringes and focused spots are recorded and analyzed. As a result, the optical axis can be driven to shift precisely in the lens aperture, and the lens maintains its focusing ability. The experimental results are consistent with the theoretical analysis, and good performance of the LC lens is demonstrated.
提出并演示了一种具有横向可移动光轴的液晶（LC）透镜。该透镜的光轴可以在不影响其光学性能的情况下在透镜孔径内移动。该透镜由两个玻璃基板构成，其内部表面具有相同的交叉指状梳型电极，彼此成 90°取向。两个基板之间的电压差分布由 8 个驱动电压决定，并控制在 LC 材料的线性响应区域内，从而产生抛物线相位分布。在实验中，制备了一个 LC 层厚为 50 μm、孔径为 2 mm×2 mm 的 LC 透镜。记录和分析了干涉条纹和聚焦光斑。结果表明，光轴可以精确地在透镜孔径内移动，并且透镜保持其聚焦能力。实验结果与理论分析一致，证明了 LC 透镜的良好性能。
