Quantum optical models for nanolaser and nanolaser arrays

有了这个提议，我只申请Sachmittel：1)Paul Gartner博士在不来梅大学停留两个月，2)旅费在2018年的光子学西部会议上展示这个项目所取得的成果，3)发表所获得的结果。这包括新的激光结构，如具有半导体量子井增益介质的纳米束腔，并进一步扩展到原子薄的过渡金属二卤化物，当放置在光子晶体腔顶部时，它可以作为增益材料。与传统的边缘发射激光器不同，本项目要研究的结构是高贝塔激光器，即使用高质量的纳米腔来定制自发辐射本身的系统，并且在存在局部强电磁场的情况下进行激光。Garters博士在二维半导体和格林函数方法方面的专业知识将对计划中的研究具有重要价值。第二个研究主题涉及Jaynes-Cummings晶格中的无序效应，例如由腔模的光谱位置波动引起的，这种效应通常存在于光刻或外延生长的半导体结构中。当几个单独的纳米激光器耦合形成腔阵列时，特性敏感地依赖于这种波动。在初步工作的基础上，考虑了阵列的理想和相同的构建块，以及Gartner博士的无序效应。这将使我们能够指定与由Qunatum-Dot微柱激光阵列制成的Jaynes-Cummings晶格有关的参数条件。此外，发展的模型和取得的进展将使我们能够在技术上现实的条件下研究量子相变和关联效应。

With this proposal I apply only for Sachmittel: 1) for a stay of Dr. Paul Gartner at the University of Bremen for a duration of two months, 2) for travel costs to present the results obtained in this project at the Photonics West conference in 2018, and 3) for publication of the obtained results.Together with the guest Dr. Paul Gartner, this project aims at developing new laser models for two-dimensional gain media. This includes novel laser structures, such as nanobeam cavities with semiconductor quantum-well gain media, and further extends to atomically thin transition-metal dichalcogenides that can act as gain material when placed on top of photonic crystal cavities. In contrast to conventional edge-emitting lasers, the structures that are to be investigated in this project are high-beta lasers, i.e. systems, in which high-quality nanocavities are used to tailor spontaneous emission itself, and in which lasing takes place in the presence of locally strong electromagnetic fields. Dr. Garters expertise with two-dimensional semiconductors and Greens' function methods will be of great value for the planned investigations.A second research topic concerns disorder effects in Jaynes-Cummings lattices, such as resulting from fluctuations in the spectral position of cavity modes, that are generally present in lithographically or epitaxially grown semiconductor structures. When several individual nanolasers are coupled to form a cavity array, the properties sensitively depend on such fluctuations. Based on preliminary work, in which ideal and identical building blocks of the array have been considered, together with Dr. Gartner disorder effects will be investigated. This will put us in a position to specify parameter conditions in connection with the fabrication of Jaynes-Cummings lattices made from qunatum-dot micropillar laser arrays. Furthermore, the developed models and the progress made will enable us to study quantum phase transitions and correlation effects under technically realistic conditions.