Molecular Beam Epitaxy of Oxide Based Metamaterials

il y a 2 semaines

Lyon, France CNRS - Institut des Nanotechnologies de Lyon Temps plein

**Molecular beam epitaxy of oxide based metamaterials and in-situ control of their functional properties by real-time measurements**:

- Réf
- **ABG-111971**
- Sujet de Thèse- 10/03/2023- Contrat doctoral- CNRS - Institut des Nanotechnologies de Lyon- Lieu de travail- Ecully (near Lyon) - Auvergne-Rhône-Alpes - France- Intitulé du sujet- Molecular beam epitaxy of oxide based metamaterials and in-situ control of their functional properties by real-time measurements- Champs scientifiques- Matériaux
- Mots clés- Molecular beam epitaxy, functional oxides, optical metamaterials, in-situ real-time characterizations**Description du sujet**:
**Scientific field and context**:
**Objectives**:
**Scientific challenges**:

- The main challenges of the project are:
- Development of real-time measurements during growth: the proposed measurements are original or applied for the first time to the growth of oxides, and their implementation therefore constitutes a challenge that the thesis project proposes to take up. The real-time combined analysis of different structural and functional measurements to build a coherent overview of the functional properties of the growing materials is also a challenge.
- Correlation between structural properties and functional properties: understanding the correlation between the structure of the metamaterials and their optical response is a challenge, especially since the optical properties of oxides are barely known compared to those of semiconductors, for instance. The tools and expertise available in the framework of this project will make it possible to take up this challenge.

**Original contributions expected**:

- The PhD student will be at the heart of the project, and will be more particularly in charge of the following aspects:
- Growth of oxide-based structures by molecular beam epitaxy, and instrumental developments for the implementation of the in-situ and real-time characterization tools
- Structural and chemical characterizations of the epitaxial layers: X-ray diffraction, transmission electron microcopy, XPS, AFM, possible measurement campaigns at SOLEIL and ESRF synchrotrons
- Functional characterizations of the epitaxial layers, in particular by ellipsometry. Development of strategies for the optical characterization of anisotropic thin-films
- For these activities, the doctoral student will of course take benefit of the expertise and resources available in the laboratory or within the dense collaborative network of the team.**Research program and proposed scientific approach**:

- The activities of the doctoral student will initially be focused on the development of the in-situ and real-time characterization techniques, and the associated analysis tools. When the first structures will available, the optimal experimental protocols for their structural characterization will be set up, and the appropriate optical characterization tools will be developed (for anisotropic materials in particular).- In a second step, activities will focus on evaluating the potential of metamaterials based on functional oxides for optics. This will generally involve understanding the correlation between structure and optical properties and implementing appropriate design strategies on this basis. The structures thus predicted will be fabricated and their properties will be measured, and compared to the state of the art.**External collaboration(s)/partnership(s)**
- For transmission electron microscopy: access to the Lyon joint microscopy center (CLYME). Possible external collaborations, particularly with the SuperSTEM platform in England, to access to state-of-the-art measurements.
- Possible collaborations with the SOLEIL and ESRF synchrotrons for advanced in situ and real-time structural characterizations (photoemission and surface diffraction).
- Collaborations with the i-lum team at INL for optical characterizations and metamaterial design.

**References**:

- [1] M. Bouras et al., Chem. Mater. 6, 1755, (2019)- [2] R. Ramesh et al., Nature Review Materials 4, 257, (2019)- [3] Y. Du et al., Appl. Phys. Lett. 104, 163110, (2014)- [4] A. Arnoult et al., Scientific Reports 11, 9393, (2021)- [5] M. Schubert et al., Optic Letters 27, 2073, (2002)**Nature du financement**:

- Contrat doctoral**Précisions sur le financement**:

- 1600€ net/month**Présentation établissement et labo d'accueil**:

- CNRS - Institut des Nanotechnologies de Lyon- The thesis will take place in the functional materials and nanostructures team at INL- PhD director : Guillaume Saint-Girons, CNRS research director- Co-supervisor : Clarisse Furgeaud, CNRS researcher-
- For transmission electron microscopy: access to the Lyon joint microscopy center (CLYME). Possible external collaborations, particularly with the SuperSTEM platform in England, to access to state-of-the-art measurements.
- Possible collaborations with the SOLEIL and ESRF synchrotrons for advanced in situ and real-time structural characterizations (phot

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