 | II-VI semiconductors 1D nanostructures for light emission October 1, 2022 - September 30, 2025 The aim of the thesis is to realize II-VI nanowires (ZnS, ZnO, ZnSe), vertically oriented, and defects free. The materials will be grown by using Metal-Organic Chemical Vapor Deposition (MOCVD), and more precisely a catalyzed process called vapour-liquid-solid (VLS) for which the nanowire growth is locally triggered and further produced under a gold droplet. The morphology and the structural properties of the grown nanowires will be accurately characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to understand the growth mechanisms. The optical properties will be investigated by micro-photoluminescence at 4K and nano-cathodoluminescence, as well as single photon emission in ZnO. Finally, complex II-VI nanostructures such as core-shell structures (e.g. ZnS nanowires covered with a thin ZnMgS layer), or ZnS/ZnSe axial quantum wells will be synthesized. The phD sudent will have the opportunity to attend and present his/her work at national and international conferences. |
| Study of Magneto-plasmonic coupling in hybrid nanostructures October 1, 2022 - September 30, 2025 This project concerns an in-depth study of the magneto-plasmonic coupling in magnetic/metallic nanostructures to study the strength and nature of the interaction between the different components of the hybrid materials. In particular we will perform detailed ferromagnetic resonance ad surface plasmon resonances to elucidate the type and strength of coupling.In this project we aim to exploit these characteristics of FMR to study the nature of magneto-plasmonic interactions between a periodic metallic structured component (plasmonic structures), typically a plasmonic grating structure, and a magnetic thin film or nanostructure. It has been postulated that the reverse Faraday effect effectively induces a magnetic field component from the plasmon resonance in the metallic grating into the magnetic layer (Kazlou, 2021). We will make in-depth studies of the induced field via the FMR field, which provides an unambiguous measurement of the local internal field in the ferromagnetic (or ferrimagnetic) layer. |
| ANR funded PhD position: Integrated quantumphotonics based on single photon emitters in 2D materials October 1, 2022 - September 30, 2025 Optically active deep defects in the solid state can be seen as artificial atoms. These so-called colour centres represent a major interest in quantum information science, owing to their potential as single photon emitters and their possible integration in nanostructures and devices. An emblematic example is the NV (nitrogen-vacancy) centre in diamond. Recently discovered colour centres in the 2D material hBN (hexagonal boron nitride) bring new perspectives of integration and applications in quantum technologies. |
| Super plasmonic structures based on fluorescent nano-aggregates for the generation of quantum states of light October 1, 2022 - September 30, 2025 The goal of this thesis is to enhance the collective effects at low temperature on aggregates covered with gold by developing new structures based on these superparticles. The aggregates will be organized in super-structures in order to enhance the collective effects. For this, we know how to manipulate the aggregates using an atomic force microscope and to form chains or networks of superparticles (Figure 1b). FDTD simulations are carried out in parallel to optimize the super-structure. The student will be in charge of the development of these new sources and their studies with a confocal microscope system operating at room or cryogenic temperature associated with a photon counting device (Hanbury Brown and Twiss setup), and spectrophotometric devices. |
