Coherent Control of the Optical Emission in a Single Organic Quantum Wire
Coherent Control of the Optical Emission in a Single Organic Quantum Wire
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DOI：
10.1021/nl2031822
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发表时间：
2011-10-01
期刊：
影响因子：
10.8
通讯作者：
Legrand, Laurent
中科院分区：
文献类型：
--
作者：
Holcman, Jeremy;Al Choueiry, Antoine;Legrand, Laurent
我们报告了在扩展的准完美有机量子线中纯电子激子态的第一个相干控制实验，聚二乙炔链在其自身单体的晶体基质中被隔离。当两个亚皮秒激光脉冲之间的相对相位变化时，测量单线的时间积分发光。从可见性函数中提取激子消相时间，并对其温度依赖性进行了研究。我们的工作指出了热化在相松弛动力学中的主要作用。通过显微成像光谱学，我们还表明，尽管局部激发，在微米尺度上链上的离域状态上实现了相干控制。
We report on the first coherent control experiments on a purely electronic exciton state in an extended quasi-perfect organic quantum wire, a polydiacetylene chain isolated in the crystalline matrix of its own monomer. The time-integrated luminescence of a single wire is measured as the relative phase between two exciting sub-picosecond laser pulses is varied. From visibility functions the exciton dephasing time is extracted and its temperature dependence studied. Our work points the predominant role of thermalization upon the phase relaxation dynamics. By means of microscopic imaging spectroscopy we also show that despite local excitation coherent control is achieved on states delocalized over the chain at the micrometric scale.