Long-Range Transport of Organic Exciton-Polaritons Revealed by Ultrafast Microscopy,ACS Photonics

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Long-Range Transport of Organic Exciton-Polaritons Revealed by Ultrafast Microscopy
ACS Photonics ( IF 6.5 ) Pub Date : 2017-12-26 00:00:00 , DOI: 10.1021/acsphotonics.7b01332
Georgi Gary Rozenman ₁ , Katherine Akulov ₁ , Adina Golombek ₁ , Tal Schwartz ₁

Affiliation

The excitations in organic materials are often described by Frenkel excitons, whose wave functions are tightly localized on the individual molecules, which results in short-range, nanoscale transport. However, under strong light-molecule coupling, new quantum states, known as cavity polaritons, are formed and the wave functions describing the coupled system extend over distances much larger than the molecular scale. Using time-resolved microscopy we directly show that this fundamental modification in the nature of the system induces long-range transport in organic materials and propagation over several microns. By following the motion of polaritons in real-time, we measure the propagation velocity of polaritons and we find that it is surprisingly lower than expected. Our approach sheds new light on the fundamental characteristics of polaritons and can provide critical information for the design of future organic-electronic devices, which will harness the polaritonic properties to overcome the poor conductance of organic materials.

中文翻译：

超快显微镜显示的有机激子-紫罗兰酮的远距离运输。

Frenkel激子通常描述有机材料中的激发，其波函数紧密地局限在单个分子上，从而导致短距离的纳米级迁移。但是，在强光-分子耦合作用下，形成了称为腔极化子的新量子态，描述耦合系统的波函数延伸的距离远大于分子尺度。使用时间分辨显微镜，我们直接显示出系统本质上的这种根本性修改会引起有机材料的远距离传输并传播数微米。通过实时跟踪极化子的运动，我们测量了极化子的传播速度，我们发现它出乎意料地低于预期。

更新日期：2017-12-26

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