论文标题
单个自组装CDSE纳米板链和簇的傅立叶成像揭示了平面外偶极子的贡献
Fourier-imaging of single self-assembled CdSe nanoplatelet chains and clusters reveals out-of-plane dipole contribution
论文作者
论文摘要
荧光半导体纳米平板电脑（外延量子井）可以通过出色的单分散性并在高度有序的结构中自我组合而合成。由于强烈的机械，电子或光学相互作用，它们的电子和发光特性的修改一直是最近讨论的主题。在本文中，我们使用傅立叶成像来测量各种纳米骨骼组件的不同偶极子分量。通过比较不同的测量条件并通过极化分析来证实它们，我们证实了偶极子成分的出色精度。对于单个纳米片，仅证明仅面内偶极子（与血小板平面平行）。另一方面，对于2-10个血小板和30-300个血小板的链条的簇，展示了一个清晰的平面外偶极子分量。随着血小板数量的增加，它的贡献变得更加重要。我们审查了可能的解释，并提出添加的平面外偶极子可以通过应变诱导的纳米血压变形引起。
Fluorescent semiconductor nanoplatelets (epitaxial quantum wells) can be synthesized with excellent monodispersity and self-assembled in highly-ordered structures. Modifications of their electronic and luminescence properties when stacked, due to strong mechanical, electronic or optical interactions between them, have been the topic of intense recent discussions. In this paper, we use Fourier imaging to measure the different dipole components of various nanoplatelet assemblies. By comparing different measurement conditions and corroborating them with polarimetric analysis, we confirm an excellent precision on the dipole components. For single nanoplatelets, only in-plane dipoles (parallel to the platelet plane) are evidenced. For clusters of 2-10 platelets and chains of 30-300 platelets, on the other hand, a clear out-of-plane dipole component is demonstrated. Its contribution becomes more significant as the number of platelets is increased. We review possible explanations and suggest that the added out-of-plane dipole can be induced by strain-induced nanoplatelet deformations.
