Ultrafast dynamics of light-matter-coupling processes in functionalized semiconductor nanowire structrures

该项目的目标是使用飞秒激光光谱学来研究半导体纳米线，其功能化表面和周围介质之间发生的过程的动力学。我们将应用不同的光谱技术来解决这些过程预计发生的不同时间尺度。双色泵浦-探测透射光谱将允许研究纳米线/布拉格结构中的极化激元放大以及纳米线和附着的有机层之间的能量和电子转移过程。光谱和时间分辨的光致发光测量的ps到ms的时间尺度将被用来澄清在纳米线/过渡金属或纳米线/稀土系统以及纳米线LED结构的激发通道和衰减途径的动态。预期结果提供关于激发态寿命和通道/路径的信息，通过该通道/路径，能量和电子在功能化纳米线结构的不同组分之间交换。此外，将解决的问题，表面和环境如何影响纳米线表面区域的电子能带结构。“

„The goal of this project is to use femtosecond laser spectroscopy to study the dynamics of the processes occurring between semiconductor nanowires, their functionalized surfaces and the surrounding medium. We will apply different spectroscopy techniques to address the different time scales on which these processes are expected to happen. Two-color pump-probe transmission spectroscopy will allow studying polariton amplification in nanowire/Bragg structures as well as energy and electron transfer processes between nanowires and attached organic layers. Spectrally and time-resolved photoluminescence measurements on a ps to ms time scale will be used to clarify the dynamics of the excitation channels and decay pathways in nanowire/transition-metal or nanowire/rare-earth systems as well as nanowire LED structures. The results are expected to provide information about excited-state lifetimes and channels/pathways through which energy and electrons are exchanged between the different components of the functionalized nanowire structures. Further, the question will be addressed how surface and environment affect the electronic band structure in the nanowire surface region.“