Radiative Pumping and Propagation of Plexcitons in Diffractive Plasmonic Crystals.,Nano Letters

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Radiative Pumping and Propagation of Plexcitons in Diffractive Plasmonic Crystals.
Nano Letters ( IF 9.6 ) Pub Date : 2018-07-17 , DOI: 10.1021/acs.nanolett.8b01733
Yuriy Zakharko ₁ , Marcel Rother ₁ , Arko Graf ₁ , Bernd Hähnlein ₂ , Maximilian Brohmann ₁ , Jörg Pezoldt ₂ , Jana Zaumseil ₁

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Strong coupling between plasmons and excitons leads to the formation of plexcitons: quasiparticles that combine nanoscale energy confinement and pronounced optical nonlinearities. In addition to these localized modes, the enhanced control over the dispersion relation of propagating plexcitons may enable coherent and collective coupling of distant emitters. Here, we experimentally demonstrate strong coupling between carbon nanotube excitons and spatially extended plasmonic modes formed via diffractive coupling of periodically arranged gold nanoparticles (nanodisks, nanorods). Depending on the light-matter composition, the rather long-lived plexcitons (>100 fs) undergo highly directional propagation over 20 μm. Near-field energy distributions calculated with the finite-difference time-domain method fully corroborate our experimental results. The previously demonstrated compatibility of this plexcitonic system with electrical excitation opens the path to the realization of a variety of ultrafast active plasmonic devices, cavity-assisted energy transport and low-power optoelectronic components.

中文翻译：

丛等离子体激元晶体中丛状激子的辐射泵浦和传播。

等离子体激元与激子之间的强耦合导致了plexcitons的形成：准粒子结合了纳米级的能量限制和明显的光学非线性。除了这些局部模式之外，对传播的丛集子的色散关系的增强控制还可以实现远距离发射器的相干和集体耦合。在这里，我们实验证明了碳纳米管激子与通过周期性排列的金纳米颗粒（纳米盘，纳米棒）的衍射耦合形成的空间扩展等离子体模式之间的强耦合。取决于光物质的组成，寿命较长的plexcitons（> 100 fs）会在20μm范围内发生高度定向传播。用时域有限差分法计算的近场能量分布完全证实了我们的实验结果。

更新日期：2018-07-11

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