From molecules to materials: SHG-CD microscopy of structured chiral films

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2024-09-25 DOI:10.1016/j.apsusc.2024.161331

Johannes Pittrich , Kevin Liang , Lukas Dörringer , Reinhard Kienberger , Ulrich Heiz , Aras Kartouzian , Hristo Iglev

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Abstract

The interplay between molecular and structural chirality as a function of local sample morphology determines the nonlinear optical properties of many organic and hybrid organic–inorganic thin films. Here, we used second harmonic generation circular dichroism (SHG-CD) microscopy of thin molecular films of 1,1′-bi-2-naphthol (R-BINOL) as a research model. Our results show that the SHG signal measured at frequencies close to the electronic transition of BINOL molecules is resonantly enhanced by more than an order of magnitude compared to the non-resonant case. The extracted resonant SHG-CD signal is dominated by the chiral response of the molecule. In contrast, structural chirality determines the non-resonant SHG-CD images. We see clear evidence that the interference of the SHG signals caused by the molecular and structural chirality can lead to a decrease in the overall SHG intensity when both SHG signals are out of phase. These findings highlight the intricate relationship between molecular and structural chirality on the one hand and structural morphology on the other hand and pave the way for novel applications by exploiting the chiroptic properties of thin films.

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从分子到材料：结构化手性薄膜的 SHG-CD 显微技术

分子和结构手性之间的相互作用作为局部样品形态的函数，决定了许多有机和有机-无机混合薄膜的非线性光学特性。在此，我们以 1,1′-联-2-萘酚（R-BINOL）的分子薄膜为研究模型，使用二次谐波发生圆二色性（SHG-CD）显微镜。我们的研究结果表明，与非共振情况相比，在接近 BINOL 分子电子转变频率处测量到的 SHG 信号共振增强了一个数量级以上。提取的共振 SHG-CD 信号受分子手性响应的支配。相反，结构手性决定了非共振 SHG-CD 图像。我们清楚地看到，分子和结构手性引起的 SHG 信号干扰会导致 SHG 信号相位失调时整体 SHG 强度下降。这些发现凸显了分子和结构手性与结构形态之间错综复杂的关系，并为利用薄膜的手性特性实现新型应用铺平了道路。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.