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首页> 外文期刊>Optics and Lasers in Engineering >Monitoring molecular orientational order in NLO push-pull based polymeric films via photoacoustic measurements
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Monitoring molecular orientational order in NLO push-pull based polymeric films via photoacoustic measurements

机译：通过光声测量监测基于NLO推挽的聚合物薄膜中的分子取向顺序

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摘要

The pulsed-laser photoacoustic-technique (PLPA) was implemented to characterize molecular orientational order and anisotropy in push-pull poled polymeric films as function of temperature and laser polarization. Traditionally, photoacoustic signals are considered to be directly proportional to the linear optical absorption in amorphous media. In this work, however, it is shown that photoacoustic signals can also be highly sensitive to the material anisotropy when convenient polarization dependent photoacoustic analyses are performed. Thus, variation of the molecular orientation in organic films, comprising rod-like polar chrom-ophores, can be unambiguously monitored via rms-analyses performed on the amplitude of the generated opto-acoustical PLPA-signals as function of the incident laser polarization. This result can be useful for the characterization of organic-based nonlinear optical (NLO) poled films and, in general, in studies of anisotropic materials. In fact, in this work we were able to accurately determine the molecular order parameter (4>) of a NLO-active spin-coated polymeric film containing optically active push-pull chromophores. These molecules, previously oriented via an electrical-poling procedure, are capable to exhibit strong second harmonic generation (SHG) effects. The PLPA-measurements were systematically compared to the linear UV-vis optical absorbance spectra while heating the poled film sample in order to monitor the thermally induced molecular disorder, so that the order parameter may be photo-acoustically evaluated via the PLPA-signals generated from the poled to the unpoled film phase. These PLPA-experiments were performed taking into account the UV-vis reference spectra for calibration and comparison purposes in the evaluation of the order parameter. A significant advantage of the PLPA-technique over commonly used optical spectral methodologies is its convenient applicability in samples exhibiting poor or null optical transmission.
机译：实施脉冲激光光声技术（PLPA）来表征推挽极化聚合物薄膜中分子取向顺序和各向异性随温度和激光偏振的变化。传统上，光声信号被认为与非晶态介质中的线性光学吸收成正比。然而，在这项工作中，表明了当执行方便的偏振相关的光声分析时，光声信号对材料各向异性也非常敏感。因此，可以通过对所产生的光声PLPA信号的幅度进行rms分析来明确监测包含棒状极性生色团的有机膜中分子取向的变化，该变化是入射激光偏振的函数。该结果可用于表征有机基非线性光学（NLO）极化薄膜，并且通常可用于各向异性材料的研究。实际上，在这项工作中，我们能够准确确定包含旋光推挽生色团的NLO旋涂聚合物薄膜的分子有序参数（4>）。这些分子先前通过电极化过程进行了定向，能够表现出强大的二次谐波生成（SHG）效果。在加热极化膜样品时，将PLPA测量值与线性UV-vis光学吸收光谱进行了系统比较，以监测热诱导的分子无序现象，以便可以通过从中生成的PLPA信号对声级进行光声评估。极化到未极化的胶片阶段。这些PLPA实验是在评估阶数参数时考虑到UV-vis参考光谱进行校准和比较的目的而进行的。与常用的光谱方法相比，PLPA技术的显着优势是其在显示不良或无效光学传输的样品中具有便利的适用性。

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  • 来源
    《Optics and Lasers in Engineering》 |2011年第12期|p.1413-1421|共9页
  • 作者

    V. Torres-Zuniga; R. Castaneda-Guzman; O.G. Morales-Saavedra; A.L. Perez-Martinez; T. Ogawa;

  • 作者单位

    Centro de Gencias Aplicadas y Desarrollo Tecnologico, Universidad National Autonoma de Mexico, CCADET-UNAM. Cd. Universitaria, A.P. 70-186 CP. 04510 Mexico D.F., Mexico;

    Centro de Gencias Aplicadas y Desarrollo Tecnologico, Universidad National Autonoma de Mexico, CCADET-UNAM. Cd. Universitaria, A.P. 70-186 CP. 04510 Mexico D.F., Mexico;

    Centro de Gencias Aplicadas y Desarrollo Tecnologico, Universidad National Autonoma de Mexico, CCADET-UNAM. Cd. Universitaria, A.P. 70-186 CP. 04510 Mexico D.F., Mexico;

    Instituto de lnvestigaciones en Materiales, IIM-UNAM, Universidad Nacional Autonoma de Mexico, P.O. Box 70-360, 04510 Mexico D.F., Mexico;

    Instituto de lnvestigaciones en Materiales, IIM-UNAM, Universidad Nacional Autonoma de Mexico, P.O. Box 70-360, 04510 Mexico D.F., Mexico;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    linear dichroism; opto-acoustics; poled films; nonlinear optics; m olecular ordering;

    机译：线性二色性光声;偏光膜;非线性光学;分子序;

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