Strong and weak coupling in ZnSe-based monolithic microcavities with lateral confinement

本项目的目标是将光-物质耦合应用于锌硒基单片微腔中。在此背景下，我们将重点关注三个方面。在耦合柱状微腔的弱耦合条件下，研究了量子点在微腔中的发射。它们的谐振器模式的特殊光场分布将被用来实现发射体之间的光开关。蓝光垂直腔面发射激光器(VCSEL)有多种技术应用。因此，我们将致力于实现基于微腔的光和电驱动的光子源，在微腔中使用ZnSe量子阱作为光学活性物质。为了实现低阈值激光，我们希望利用微腔中强的光与物质的相互作用，并实现几个量子阱。为此，我们将重点研究具有侧向偏振限制的结构，并分析其对光学性质的影响。这种横向限制将在光子线中实现，并利用样品表面的金色栅格。所陈述的主题是实际感兴趣的问题，并将提供有关极化激元传播和一致性的信息。此外，还将研究表面等离子体与极化子之间的相互作用。极化子的横向限制有望对极化子弛豫产生积极的影响，从而影响受激辐射的阈值。此外，还将实现产生极化子的新概念。我们将研究ZnSe量子阱中Bragg模与激子发射之间的势耦合，以形成Bragg极化子。

The objective of this project is the utilization of light-matter-coupling in ZnSe-based monolithic microcavities. In this context, we will focus on three aspects. The emission of quantum dots implemented into microcavities will be investigated in the weak-coupling regime in coupled pillar microcavities. The special optical field distribution of their resonator modes will be used to realize an optical switching between the emitters. There exists a variety of technological applications for blue emitting Vertical-cavity surface-emitting laser (VCSEL). Hence, we will work on the realization of optically and electrically driven photon sources based on microcavities with ZnSe quantum wells as optically active material in the cavity. In order to achieve low threshold lasers we want to exploit the strong light-matter interaction in microcavities with a few quantum wells implemented. For this we will focus on structures with a lateral polariton confinement and analyze the influence on their optical properties. This lateral confinement will be realized in photonic wires and by utilization of gold grids on the sample surface. The stated topics are question of actual interest and will yield information on polariton propagation and coherence. Furthermore, the interaction between surface plasmons and polaritons will be investigated. The lateral confinement of the polaritons is expected to have a positive influence on the polariton relaxation and hence on the threshold for stimulated emission. In addition, a new concept for the generation of polaritons will be realized. We will investigate the potential coupling between Bragg modes and the exciton emission in ZnSe quantum wells to form Bragg polaritons.