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Fourier-Imaging of Single Self-Assembled CdSe Nanoplatelet Chains and Clusters Reveals out-of-Plane Dipole Contribution
ACS Photonics ( IF 6.5 ) Pub Date : 2020-09-21 , DOI: 10.1021/acsphotonics.0c01066
Jiawen Liu 1 , Lilian Guillemeney 2 , Arnaud Choux 1 , Agnès Maître 1 , Benjamin Abécassis 2 , Laurent Coolen 1
Affiliation  

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.

中文翻译:

单个自组装CdSe纳米血小板链和簇的傅里叶成像揭示了平面外偶极子贡献

荧光半导体纳米片(外延量子阱)可以合成,具有出色的单分散性,并以高度有序的结构自组装。由于它们之间强烈的机械,电子或光学相互作用,当堆叠时对其电子和发光性质的修饰已成为近期讨论的主题。在本文中,我们使用傅立叶成像技术来测量各种纳米血小板组件的不同偶极子成分。通过比较不同的测量条件,并通过极化分析加以证实,我们确认了偶极子组件具有出色的精度。对于单个纳米血小板,仅证明了平面内偶极子(平行于血小板平面)。另一方面,对于2-10个血小板簇和30-300个血小板链,演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,其贡献变得更加重要。我们审查可能的解释,并建议可以通过应变诱导的纳米血小板变形来诱导增加的平面外偶极子。
更新日期:2020-10-21
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