A tunable-focus liquid crystal microlens array is demonstrated and characterized. Using two-photon polymerization based direct-laser writing, a polymerized microlens array is fabricated on one substrate. Such a microlens array creates inhomogeneous electric field distribution and homogeneous-like liquid-crystal alignment, simultaneously. The phase profile and thus the focal length can be tuned dynamically by the applied voltage. We also further investigate the focusing property and the imaging capability of the fabricated sample. Using the adaptive microlens array as an example, we demonstrate that directly forming a curvilinear surface with liquid-crystal alignment is feasible. In addition to adaptive lens, this direct-laser writing method is also a powerful tool for making other tunable photonic devices.

中文翻译：

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通过双光子聚合实现的自适应液晶微透镜阵列

说明和表征了可调焦点液晶微透镜阵列。使用基于双光子聚合的直接激光写入，在一个基板上制造了聚合的微透镜阵列。这种微透镜阵列同时产生不均匀的电场分布和均匀的液晶取向。相位曲线以及由此的焦距可以通过施加的电压来动态地调整。我们还进一步研究了所制备样品的聚焦性能和成像能力。以自适应微透镜阵列为例，我们证明直接形成具有液晶取向的曲线表面是可行的。除了自适应透镜之外，这种直接激光写入方法也是制造其他可调光子器件的有力工具。