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首页> 外文会议>Current developments in lens design and optical engineering XVII >Fabrication of focus-tunable liquid crystal microlens array with spherical electrode
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Fabrication of focus-tunable liquid crystal microlens array with spherical electrode

机译：具有球形电极的聚焦可调液晶微透镜阵列的制作

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In this paper, a new approach to fabricate a liquid crystal (LC) microlens array with spherical-shaped electrode is demonstrated, which can create the inhomogeneous electric field. Inkjet-printing, hydrophilic confinement, self-assemble and replication process is used to form the convex microlens array on glass. After the spherical-shaped electrode is done, we assemble it with ITO glass to form a liquid crystal cell. We used Zemax® to simulate the liquid crystal lens as a Gradient-index (GRIN) lens. The simulation results show that a GRIN lens model can well match with the theoretical focal length of liquid crystal lens. The dimension of the glass is 1.5 cm × 1-5 cm × 0.7 mm which has 7 concave microlens on the top surface. These microlens have same diameter and height about 300 urn and 85 μm. The gap between each other is 100 μm. We first fabricate microlens array on silicon substrate by hydrophilic confinement, which between hydrophilicity of silicon substrate and hydrophobicity of SU-8, and inkjet printing process. Then we start replication process with polydimethylsiloxane (PDMS) to transfer microlens array form silicon to glass substrate. After the transparent conducted polymer, PEDOT:PSS, is spin-coated on the microlens arrays surface, we flatten it by NOA65. Finally we assemble it with ITO glass and inkjet liquid crystal. From measuring the interference rings, the optical power range is from 47.28 to 331 diopter. This will be useful for the optical zoom system or focus-tunable lens applications.
机译：本文介绍了一种新的制备球形电极液晶（LC）微透镜阵列的方法，该方法可以产生不均匀的电场。喷墨印刷，亲水限制，自组装和复制过程被用来在玻璃上形成凸微透镜阵列。球形电极制成后，我们将其与ITO玻璃组装在一起以形成液晶单元。我们使用Zemax®将液晶透镜模拟为梯度折射率（GRIN）透镜。仿真结果表明，GRIN透镜模型可以很好地匹配液晶透镜的理论焦距。玻璃的尺寸为1.5厘米×1-5厘米×0.7毫米，其顶面上有7个凹面微透镜。这些微透镜具有相同的直径和高度，约为300 um和85μm。彼此之间的间隙为100μm。我们首先通过亲水限制在硅基底的亲水性和SU-8的疏水性之间进行微透镜阵列制造，并通过喷墨印刷工艺。然后，我们开始使用聚二甲基硅氧烷（PDMS）进行复制过程，以将微透镜阵列从硅转移到玻璃基板上。将透明导电聚合物PEDOT：PSS旋涂在微透镜阵列表面后，我们用NOA65将其弄平。最后，我们将其与ITO玻璃和喷墨液晶组装在一起。通过测量干涉环，光功率范围为47.28至331屈光度。这对于光学变焦系统或可调焦镜头应用很有用。

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