Single quantum dot lasers and coupled cavity arrays

本课题的目标是在半导体量子点的基础上实现和研究单发射器激光器和耦合激光阵列。单发射器激光的体制从根本上不同于传统的激光器，并提供新颖和有趣的物理概念和应用。这种激光是由量子效应和相关效应驱动的，目前还没有完全理解。除了理论描述和概念理解之外，技术实现和实验表征提供了苛刻的挑战。通过结合微观建模、量子光谱学和纳米尺度样品制备，该项目旨在提供对单发射器激光器的结论性理解。实现这一目标的一种方法是在具有超高质量因子和低量子点密度的微腔谐振器中使用谐振以及双色激励方案。特别关注的是与高效低功率光电器件高度相关的电泵浦单发射器激光器。本课题借鉴了在光激发下这些系统的研究中获得的专业知识。这些新的激光形式的实现和理解将是具有可调谐统计特性的新型光子源发展的一个里程碑。一个进一步的创新子项目通过将几个单量子点激光器耦合到一个激光阵列来增加这一点，这将形成激光系统内外集体效应研究的基础。理论、技术和实验之间的紧密合作是项目的关键。样品制备和光谱学将受益于微观模型的输入和反馈。这将导致对潜在物理过程的全面描述和基本理解，从而能够在未来的应用中对单发射器激光活动进行定量预测。

The goal of this project is the realization and investigation of single emitter lasers and coupled laser arrays on the basis of semiconductor quantum dots. The regime of single-emitter lasing fundamentally differs from that of conventional lasers and offers novel and intriguing physical concepts and applications. Such lasers are driven by quantum- and correlation effects that are, currently, not completely understood. In addition to their theoretical description and conceptual understanding the technological realization and experimental characterisation provide demanding challenges. By combining microscopical modelling, quantum-optical spectroscopy and nano-scale sample preparation, the project aims at providing a conclusive understanding of single-emitter lasers. One way of achieving this will be to use resonant, as well as two-color excitation schemes in microcavity resonators with ultra-high quality factors and low quantum-dot density.A particular focus is on electrically pumped single-emitter lasers that are of highest relevance for efficient low-power optoelectronic devices. This topic lends from the expertise gained in the investigations of these systems under optical excitation. The realization and understanding of these new laser forms will be a milestone in the development of novel sources of photons with tunable statistical properties. A further innovative sub-project adds to this by coupling several single-quantum-dot lasers to a laser array, which will form the basis of studies on collective effects in and outside the lasing regime.The close and intensive collaboration between theory, technology and experiment is key to the project. Sample preparation and spectroscopy will benefit from the input and feedback drawn from microscopical models. This will lead to the full description and fundamental understanding of the underlying physical processes, enabling quantitative predictions of single-emitter lasing activity in future applications.