超快Laser纳米结构ITO用作液晶取向层和高透明度电极
Ultrafast Laser Nanostructured ITO Acts as Liquid Crystal Alignment Layer and Higher Transparency Electrode
摘要：
具有更高透明度的电极也可以使液晶（LC）取向，这对于LC显示器的成本和能耗的改善非常重要。在这里，我们首次证明了液晶在飞秒激光纳米结构氧化铟锡（ITO）涂层玻璃上的取向，由于界面反射较少，因此也表现出更高的透明度。采用飞秒激光直接在ITO薄膜上制备纳米粒子，无需任何额外的旋涂材料或光刻工艺。九个区域的激光诱导纳米结构的制造与不同的取向和不同的脉冲能级的顶部的ITO。发现装置界面锚定能与光敏聚合物上的CNOLC的锚定能相当。该器件表现出30：1的对比度和330ms的弛豫时间，预期厚LC器件。具有两个ITO纳米光栅衬底的LC器件的测量的透明度比基于均匀ITO膜的LC器件高10%。这里提出的对准方法为改进的LC显示器和新结构的LC光子器件铺平了道路。
英文摘要：
Electrodes with higher transparency that can also align liquid crystals (LCs) are of high importance for improved costs and energy consumption of LC displays. Here we demonstrate for the first time alignment of liquid crystals on femtosecond laser nanostructured indium tin oxide (ITO) coated glass exhibiting also higher transparency due to the less interface reflections. The nano paterns were created by fs laser directlly on ITO films without any additional spin coating materials or lithography procces. Nine regions of laser-induced nanostructures were fabricated with different alignment orientations and various pulse energy levels on top of the ITO. The device interfacial anchoring energy was found to be comparable to the anchoring energy of nematic LC on photosensitive polymers. The device exhibits contrast of 30:1 and relaxation time of 330ms expected for thick LC devices. The measured transparency of the LC device with two ITO nanograting substrates is 10% higher than the uniform ITO film based LC devices. The alignment methodology presented here paves the way for improved LC displays and new structured LC photonic devices.
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