Description : Two-dimensional thin films are well-known for their high optical nonlinearities. For this reason, they
are currently the best candidates for mode-locking of laser systems.1 Recently, during two PhD thesis, we optimized Sb2Te3 and Bi2Se3 layers to obtain significant nonlinear absorption. More specifically, the saturable absorption behavior obtained was the highest ever reported in the field of nonlinear optics by similar experimental techniques.2-5.
These high optical nonlinearities are emanating from the topological insulator character of the layers which can be observed in 2D structures. However, the relation between the structural characteristics of topological insulators and their optical nonlinearities is still not sufficiently explored. The target of the thesis is to shed light on the origins of the nonlinear optical properties of 2D topological insulators (like Sb2Te3, Bi2Te3 and Bi2Se3). This will allow a better understanding of the physical mechanisms that give rise to the nonlinear refraction and absorption of the thin films. The objectives of the thesis are the following :
- Objective 1 : Thin film deposition and preparation.
- Objective 2 : Nonlinear optical studies.
- Objective 3 : Ultrafast dynamics of the 2D layers.
Laboratoire : Institut Fresnel, 52 Av Escadrille Normandie Niemen, 13013 Marseille
Directeur de thèse : Iliopoulos Konstantinos, Equipe ILM
Financement : Aix Marseille Université.
Durée : 36 mois
Contact : Iliopoulos Konstantinos konstantinos.iliopoulos@fresnel.fr
Documents demandés : CV, notes, lettre de motivation
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