Chiromagnetoptics of Au and Ag Nanoparticulate Systems,The Journal of Physical Chemistry C

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Chiromagnetoptics of Au and Ag Nanoparticulate Systems
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-09-04 , DOI: 10.1021/acs.jpcc.0c06496
O. Kovalenko ₁ , M. Vomir ₁ , B. Donnio ₁ , J. L. Gallani ₁ , M. V. Rastei ₁

Affiliation

Photoelectron excitations into unoccupied energy states are fundamental in solid-state physics and many modern applications. The operation of such internal electronic transitions relies not only on photon absorption efficiency, which is pivotal in sensing, photovoltaics, active plasmonics, etc., but also on light–matter interactions and near/far-field spectroscopic techniques. Here, we report on a spectroscopic absorption fingerprint in magnetic circular dichroism (MCD) responses of various nanoparticulate systems. MCD spectra acquired at low temperatures on assemblies of uncoupled/coupled Ag and Au nanoparticles reveal asymmetric MCD spectral line shapes strongly depending on the nature and shape of nanoparticles and on their interparticular interactions. Assembling for instance the NPs into 2D networks with interparticle distances allowing dipolar interactions or transforming the spherical nanoparticles into disks was found to significantly alter the magneto-optic response in the spectral line shape. The findings are interpreted within the framework of chiral magneto-plasmonic effects by considering the k-dependent electronic states involved in both inter- and intraband electronic transitions.

中文翻译：

金和银纳米粒子系统的色相

在固态物理和许多现代应用中，将光电子激发为未占据的能量状态是基础。这种内部电子跃迁的运行不仅依赖于光子吸收效率，而光子吸收效率在传感，光伏，有源等离子等方面至关重要，还取决于光-物质相互作用和近/远场光谱技术。在这里，我们报告了各种纳米粒子系统的磁性圆二色性（MCD）反应中的光谱吸收指纹。在低温下在未偶联/偶联的Ag和Au纳米颗粒的组装体上获得的MCD光谱显示，非对称MCD光谱线的形状强烈取决于纳米颗粒的性质和形状以及它们之间的相互作用。例如，发现将NPs组装成2D网络，粒子间的距离允许偶极相互作用或将球形纳米粒子转变为圆盘，从而显着改变光谱线形中的磁光响应。在手性磁等离子体效应的框架内，通过考虑带间和带内电子跃迁都涉及k依赖的电子态。

更新日期：2020-10-02

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