Microscopic description of tunnel-injection quantum-dot lasers

隧道注入量子点激光器的微观描述

• 批准号: 281512079
• 负责人: Professor Dr. Frank Jahnke
• 金额: --
• 依托单位: Institut of Physics
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/281512079?language=en
• 关键词: Microscopic; description; tunnel; injection; quantum

The goal of this project is to advance the design of semiconductor lasers, which have the potential to strongly improve fiber-based optical data communication as used for the internet. The design is based on a tunnel-injection (TI) structure with quantum dots (QDs) as active material and promises strongly improved modulation speed. The challenge for the design lies in the interplay between different nanostructure components: the inhomogeneously broadened QD ensemble, the TI barrier, and the bulk barrier material used for carrier injection. The physics underlying such a device has several demanding aspects. Carrier transport connects three-, two-, and zero-dimensional structures, the carrier scattering processes between these structures is governed by many-body effects, and the device performance depends on the interplay between carrier dynamics and gain properties in the presence of a tunnel barrier. A consortium of leading scientists in this field, represented by Johann Peter Reithmaier (Univ. Kassel), Grzegorz Sęk (Wroclaw University of Technology) and Gadi Eisenstein (Technion, Israel Institute of Technology) is presently working on the experimental realization of high-speed TI-QD lasers and their characterization with various spectroscopic methods. The applicant has been invited to join this consortium and the structural goal of this project is to establish the framework for a new direct collaboration with all three groups. In the first funding period, new and unexpected results for the physics of TI-QD-lasers were discovered. The LO-phonon resonance condition for the alignment of QD levels turns out to be suspended by electronic state mixing in the nanostructure and many-body effects (polarons). Instead, a spectral filter effect of the TI-barrier was discovered. Only with proper alignment of this spectral filter to the inhomogeneous broadening distribution of the QD emitters the improved modulation properties of TI-QD lasers are expected. According to these new insights, during the second application period, new laser structures will be grown and characterized. In parallel, theoretical models will be expanded to conduct direct experiment-theory comparisons. Our goal is a microscopic understanding of the relevant physics underlying the device operation in TI-QD lasers and the demonstration of improved emission processes.

该项目的目的是推进半导体激光器的设计，该激光器有可能强烈改善互联网使用的基于纤维的光学数据通信。该设计基于带有量子点（QD）的隧道注入（Ti）结构，作为活性材料，并承诺强烈改善调制速度。设计的挑战在于不同纳米结构组件之间的相互作用：不均匀的QD集合，TI屏障和用于载体注入的块状屏障材料。这种设备的物理学具有多个苛刻的方面。载流子运输连接三，二和零维结构，这些结构之间的载波散射过程受多体效应的控制，并且设备性能取决于在隧道屏障存在下载体动力学和增益性能之间的相互作用。由约翰·彼得·里斯玛尔（Johann Peter Reithmaier（Univ。Kassel），GrzegorzSęK（弗罗克劳技术大学）和加迪·艾森斯坦（Gadi Eisenstein）（以色列技术研究所，以色列技术学院）由约翰·彼得·雷斯玛尔（Univ。Kassel）代表的这一领域的主要科学家联盟，正在从事高速ti-qd ti-qd hasers and septroscrizations的实验实现。该应用程序已被邀请加入该联盟，该项目的结构目标是为与所有三个小组建立新的直接合作框架。在第一个资金期间，发现了TI-QD激光器物理学的新结果。事实证明，QD水平对齐的Lo-Phonon共振条件被纳米结构中的电子状态混合和多体效应（极性）悬浮。取而代之的是，发现了Ti棒的光谱滤波器效应。只有通过将该光谱过滤器与QD发射器的不均匀扩展分布进行适当比对，才能提高TI-QD激光器的调制特性。根据这些新见解，在第二个申请期间，新的激光结构将得以生长和表征。同时，将扩展理论模型以进行直接的实验理论比较。我们的目标是对TI-QD激光器中设备操作的相关物理学的微观理解以及改进的排放过程的演示。