Wang Zhe, Chen Mingce, Hu Chai, Liu Kewei, Li Zhexun, Ye Mao, Chen Zhaomin, Yuan Xiangdong, Wang Haiwei, Xie Changsheng, Zhang Xinyu
Opt Express. 2021 Nov 22;29(24):40617-40632. doi: 10.1364/OE.444867.
A new type of liquid crystal microlens array (LCMLA) constructed by a single-layered LC material is proposed. The basic dual-mode integrated LC microlens includes a concentric microhole electrode and a central plate electrode. Compared with traditional LC microlenses driven electrically, the dual-mode integrated LC microlens presents a better light control effect, such as being flexibly adjusted between the beam convergence and divergence modes, enlarging both the tunable range of the signal voltage and the focal length and also reducing the focal spot assisted by a convex electric-field generated by the central plate electrode, acquiring a sharper beam diverging microring formed by the concave LC microlens assisted by a concave electric-field generated by the microhole electrode. At the same time, we have also verified that the electric-field filling factor of the dual-mode integrated LCMLA can be obviously increased through jointly tuning the signal voltages applied independently over both the microhole electrode and the central plate electrode. This research has laid a solid foundation for continuously developing LCMLA technology.
提出了一种由单层液晶材料构建的新型液晶微透镜阵列（LCMLA）。基本的双模集成液晶微透镜包括同心微孔电极和中心平板电极。与传统的电驱动液晶微透镜相比，双模集成液晶微透镜呈现出更好的光控制效果，例如可以在光束会聚和发散模式之间灵活调整，扩大信号电压的可调范围和焦距，并且通过中心平板电极产生的凸形电场辅助减小焦斑，通过微孔电极产生的凹形电场辅助获得由凹形液晶微透镜形成的更尖锐的光束发散微环。同时，我们还验证了通过联合调节独立施加在微孔电极和中心平板电极上的信号电压，可以明显提高双模集成LCMLA的电场填充因子。这项研究为持续发展LCMLA技术奠定了坚实的基础。
