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Optical polymers with tunable refractive index for nanoimprint technologies

机译：折射率可调的光学聚合物，用于纳米压印技术

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摘要

In order to realize a versatile high throughput production of micro-optical elements, UV-curable polymer composites containing titanium dioxide nanoparticles were prepared and characterized. The composites are based on an industrial prototype epoxy polymer. Titanium dioxide nanoparticles smaller than 10 nm were synthesized by the nonaqueous sol method and in situ sterically stabilized by three different organic surfactants. The composites exhibit high transparency. Distinct alteration of optical transmission properties for visible light and near IR wavelength range could be avoided by adaption of the stabilizing organic surfactant. Most importantly, the refractive index (RI) of the composites that depends on the fraction of incorporated inorganic nanoparticles could be directly tuned. E.g. the RI at a wavelength of 635 nm of a composite containing 23 wt% titanium dioxide nanoparticles is increased to 1.626, with respect to a value of 1.542 for the pure polymer. Furthermore, it could be demonstrated that the prepared inorganic-organic nanocomposites are well suited for the direct fabrication of low-cost micro-optical elements by nanoimprint lithography. A low response of the optical composite properties to temperature treatment up to 220 degrees C with a shrinkage of only about 4% ensures its application for integrated micro-optical elements in industrial production.
机译：为了实现微光学元件的通用高通量生产，制备并表征了包含二氧化钛纳米颗粒的可UV固化的聚合物复合材料。该复合材料基于工业原型环氧聚合物。通过非水溶胶方法合成了小于10 nm的二氧化钛纳米粒子，并通过三种不同的有机表面活性剂对其进行了空间稳定。该复合材料显示出高透明度。通过使用稳定的有机表面活性剂，可以避免可见光和近红外波长范围内光传输特性的明显变化。最重要的是，可以直接调整取决于所掺入的无机纳米粒子比例的复合材料的折射率（RI）。例如。相对于纯聚合物的1.542值，包含23 wt％的二氧化钛纳米颗粒的复合材料在635 nm波长处的RI增加到1.626。此外，可以证明所制备的无机-有机纳米复合材料非常适合通过纳米压印光刻法直接制造低成本的微光学元件。光学复合材料对高达220摄氏度的温度处理的低响应（仅约4％的收缩率）确保了其在工业生产中用于集成微光学元件的应用。

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