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首页> 外文期刊>Acta astronautica >PROCESSING OF POLED SECOND-ORDER NONLINEAR OPTICAL POLYMER SYSTEMS UNDER MICROGRAVITY CONDITIONS
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PROCESSING OF POLED SECOND-ORDER NONLINEAR OPTICAL POLYMER SYSTEMS UNDER MICROGRAVITY CONDITIONS

机译：微重力条件下POLED二阶非线性光学聚合物体系的制备

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Organic polymeric thin films for photonic applications has been a rapidly exciting area of research over the last decade. Second-order nonlinear optical polymer film is created by aligning the appropriate chromophores into a polymeric host medium by poling in an electric field followed by permanent fixation. The poling is usually conducted near T_g but the maintenance of poled order is often difficult even at room temperature because of the relaxation of the chromophore units which destroys the orientation of poled dipoles. It is expected that the rotational relaxation may be affected by polymer structure (cross-linking) and hence T_g, device temperature and possibly gravity which acts like a pressure force capable of modifying rotational transition probabilities. We report here the results of our microgravity experiments which were carried out at the ZARM drop tower facility at Bremen, Germany. Two systems were tested: guest―host system using thermal processing and cross―linked system using photocross-linking processing. Five drops of 4.75 s of microgravity were made and for each drop 15 guest―host samples and nine photo cross-linking samples were processed. The sample thickness was fixed at 2 μm; however, poling field, UV intensity, chromophore type and concentration, poling temperature and cooling rate were varied. The relaxation behavior was monitored using second harmonic generation as a function of time for both the samples prepared at 1 and 10~(-6) g. Improvement of relaxation time was observed for certain samples. Simulations using a modified Robertson―Shimha―Curro theory were also carried out. Qualitatively, experimental results support the simulation hypothesis.
机译：在过去的十年中，用于光子应用的有机聚合物薄膜一直是一个令人兴奋的研究领域。通过将适当的生色团在电场中极化，然后进行永久固定，将合适的生色团与聚合物主体介质对齐，从而形成二阶非线​​性光学聚合物薄膜。极化通常在T_g附近进行，但是即使在室温下也很难维持极化顺序，因为生色团单元的松弛会破坏极化偶极子的取向。预期旋转弛豫可能会受到聚合物结构（交联）的影响，因此会影响T_g，器件温度以及可能的重力，重力的作用类似于能够改变旋转跃迁概率的压力。我们在此报告在德国不莱梅ZARM落塔设备上进行的微重力实验的结果。测试了两个系统：使用热处理的来宾-主机系统和使用光交联处理的交联系统。制备了五滴4.75 s的微重力，每滴样品处理了15个客体-宿主样品和9个光交联样品。样品厚度固定为2μm；然而，极化场，紫外线强度，发色团类型和浓度，极化温度和冷却速率是变化的。对于在1和10〜（-6）g下制备的样品，使用二次谐波生成作为时间的函数来监测松弛行为。对于某些样品，观察到弛豫时间有所改善。还使用改进的Robertson-Shimha-Curro理论进行了仿真。定性地，实验结果支持模拟假设。

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