Nonlinear Optical Properties and Crystalline Orientation of 2-Methyl-4-nitroaniline Layers Grown on Nanostructured Poly(tetrafluoroethylene) Substrates
Nonlinear Optical Properties and Crystalline Orientation of 2-Methyl-4-nitroaniline Layers Grown on Nanostructured Poly(tetrafluoroethylene) Substrates
复制标题
纳米结构聚四氟乙烯基底上生长的 2-甲基-4-硝基苯胺层的非线性光学性质和晶体取向
DOI：
10.1021/ja991894u
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发表时间：
2000
影响因子：
15
通讯作者：
J. Zyss
中科院分区：
文献类型：
--
作者：
R. Vallée;P. Damman;M. Dosière;A. Toussaere;J. Zyss
发展了一种研究有机材料二阶非线性光学系数的新方法。结合取向晶体生长（外延或grapho-epitaxy）与掠入射X射线衍射和二次谐波椭圆偏振给出了分子超极化率和晶体非线性极化率张量之间的关系的概述。采用摩擦转移法在纳米结构聚（PTFE）基底上制备了2-甲基-4-硝基苯胺（MNA）有机薄膜。研究表明，MNA根据衬底温度以两个明确的类单晶取向结晶。低温和高温生长模式分别对应于芳环或多或少地平坦（（11−2）取向）或边缘（（010）取向）地存款在衬底上，转变温度对应于PTFE的第一有序-无序转变（约19 °C）。两种不同的取向机制是…
A new methodology to study the second-order nonlinear optical coefficients of organic materials was developed. The combination of oriented crystal growth (epitaxy or grapho-epitaxy) with grazing incidence X-ray diffraction and second harmonic ellipsometry gives an overview of the relations between the molecular hyperpolarizability and the crystalline nonlinear susceptibility tensor. Thin organic layers of 2-methyl-4-nitroaniline (MNA) were grown on nanostructured poly(tetrafluoroethylene) (PTFE) substrates prepared by the friction transfer method. The investigations show that MNA crystallizes with two definite single-crystal-like orientations depending on the substrate temperature. The low- and high-temperature modes of growth correspond to a deposit of the aromatic ring more or less flat ((11−2) orientation) or edge ((010) orientation) on the substrate, respectively, the transition temperature corresponding to the first order−disorder transition of PTFE (∼19 °C). Two different orientation mechanisms were...