Alignment of benzaldehyde materials with different photosensitivity thresholds, capable of changing the pretilt angles of nematic liquid crystal (LC) from 90° to 0° in a controlled manner under UV-B exposure, has been developed. Inhomogeneous exposure of uniform rubbed alignment layers allows the formation of a refractive index gradient inside the LC cell. The concept of tunable polarization-independent self-aligned LC lens based on gradient pretilt angle alignment materials with different photosensitivity is demonstrated. Self-alignment of two polarization-dependent sub-lens is achieved due to a single exposure act of two alignment layers, which are located on the same piece of glass on both sides, forming one common optical axis for a polarization-independent LC lens. The sub-lens cells have uniform cell gap and are independently controlled using low-voltage driving. Devices based on gradient benzaldehyde alignment materials can be used in many modern optical and photonic devices.

中文翻译：

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不同光敏度的梯度预倾角取向材料用于可调偏振无关自取向液晶透镜

已经开发出具有不同光敏阈值的苯甲醛材料的配向，能够在 UV-B 曝光下以受控方式将向列液晶 (LC) 的预倾角从 90° 改变为 0°。均匀摩擦配向层的不均匀曝光允许在 LC 单元内部形成折射率梯度。展示了基于具有不同光敏性的梯度预倾角对准材料的可调谐偏振无关自对准液晶透镜的概念。由于两个对准层的单次曝光行为实现了两个偏振相关子透镜的自对准，这两个对准层位于同一块玻璃的两侧，形成一个与偏振无关的 LC 透镜的公共光轴。子透镜单元具有均匀的单元间隙并且使用低电压驱动独立控制。基于梯度苯甲醛对准材料的器件可用于许多现代光学和光子器件。