半导体纳米血小板中等离子体耦合激子的超快动力学

IF 3.2 3区 化学 Q2 CHEMISTRY, PHYSICAL
Wei Wang, Daniel Rosenmann, Yuzi Liu, Xuedan Ma, Wooje Cho, Joshua Portner, Ruiming Lin, Dmitri V. Talapin, Ralu Divan, David J. Gosztola, Stephen K. Gray* and Gary P. Wiederrecht*, 
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引用次数: 0

摘要

纳米材料中的激子-等离子体耦合产生了许多与光子学应用相关的现象,包括增加光-物质相互作用,增强量子发射器的辐射率和相干能量交换。在激子与表面等离子激元(SPPs)耦合的情况下,由光激发波矢量控制的色散相互作用为可调谐光发射创造了机会。在耦合系统中,激子寿命也会受到强烈的时间影响,这为通过改变电子耦合强度到色散SPP来超快控制激子寿命创造了机会。在这里,我们利用沉积在银等离子体薄膜上的胶体半导体纳米片,并将结果与沉积在银薄膜上的半导体量子点进行了比较。我们绘制了耦合系统的色散图,并测量了耦合系统的超快瞬态吸收响应。由于纳米片在银膜上有更大的相互作用区域,因此发现纳米片的耦合程度更高,并且与量子点相比,发现了更快的时间响应。结合重孔和轻孔特征的菲涅耳理论计算可以重现纳米片银薄膜的色散,并且开发了一个简单的三态模型,以提供沿着色散曲线在不同光子能量下耦合的性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ultrafast Dynamics of Plasmon-Coupled Excitons in Semiconducting Nanoplatelets

Ultrafast Dynamics of Plasmon-Coupled Excitons in Semiconducting Nanoplatelets

Exciton-plasmon coupling in nanomaterials produces many relevant phenomena for photonics applications including increased light-matter interactions, enhanced radiative rates of quantum emitters, and coherent energy exchange. In the case of exciton coupling to surface plasmon polaritons (SPPs), dispersive interactions controlled by the wavevector of optical excitation create the opportunity for tunable optical emission. Strong temporal impacts on exciton lifetimes can also occur in coupled systems, creating the opportunity for ultrafast control of exciton lifetime via changes in electronic coupling magnitude to a dispersive SPP. The coupling strength can be impacted by the morphology of the nanomaterials. Here, we utilize colloidal semiconductor nanoplatelets deposited onto thin silver plasmonic films, and compare the results to semiconductor quantum dots deposited on the silver films. We map the dispersion of the coupled systems and measure the ultrafast transient absorption response of the coupled systems. Due to the larger interaction areas of the nanoplatelets that lie flat on the silver films, a greater degree of coupling is found for the nanoplatelets, and much faster temporal responses are found as compared to quantum dots. Fresnel theory calculations that incorporate heavy and light hole features can reproduce the dispersion of the nanoplatelet-silver film, and a simple three-state model is developed to provide insights into the nature of the coupling at different photon energies along the dispersion curve.

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来源期刊
The Journal of Physical Chemistry C
The Journal of Physical Chemistry C 化学-材料科学:综合
CiteScore
6.50
自引率
8.10%
发文量
2047
审稿时长
1.8 months
期刊介绍: The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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