NER: Femtosecond Pump-Probe Confocal Microscopy of ZnO Nanowire Lasers

这是一项为期一年的具体试验，目的是(1)使用空间分辨共聚焦显微镜检测来表征单个氧化锌纳米线激光器的结构，以及(2)引入泵浦受激发射倾倒探测来研究单纳米线激光器的受激发射过程。已经制备出了所需的氧化锌纳米线的形貌，并将进行合成细化，以获得质量最好的多条纳米线的结晶图案。本实验室提供的激光和共聚焦光学显微镜工具将用于光学激发氧化锌单纳米线激光介质，并检测光谱和空间分辨的受激发射。其中包括用钛宝石飞秒激光器进行的新颖的超快泵浦-倾倒实验。将探索激子-激子散射机制在晶体纳米线中产生受激发射的基础科学，以及向电子-空穴等离子体受激发射机制的转变。这些研究旨在开发新的共聚焦显微镜方法来询问纳米线激光设备，具有一次探测一个设备的特定能力。在过去的几年里，单分子光谱学实验揭示了单个分子环境的一些有趣的方面。这些研究旨在将这一非凡类型的研究转移到单纳米线激光和受激发射的研究上。

This is a NER proposal for a specific one-year trial to (1) characterize single ZnO nanowire laser structures using spatially-resolved confocal microscopy detection, and (2) to introduce pump - stimulated emission dump probing to study stimulated emission processes of single nanowire laser configurations. The requisite morphologies of ZnO nanowires have been produced and synthetic refinement will be performed to obtain the best quality crystalline patterns of multiple nanowires. Laser and confocal optical microscopy tools that are available in this laboratory will be used to optically excite ZnO single nanowire laser media and to detect spectrally and spatially resolved stimulated emission. These include novel ultrafast pump-dump experiments with a Ti:sapphire femtosecond laser. The fundamental science of the exciton-exciton scattering mechanism to produce stimulated emission in crystalline nanowires and the transition to an electron-hole plasma stimulated emission mechanism will be explored. These studies are designed to develop new confocal microscopy methods to interrogate nanowire laser devices, with the specific ability to explore a single device at a time. Single molecule spectroscopy experiments have revealed a number of intriguing aspects of individual molecular environments over the last few years. These studies are intended to transfer this remarkable type of investigation to the study of single nanowire lasers and stimulated emission.