Amphitheater Charpak (Access Tower 22, ground floor)
Adrien Khalili, doctorant dans l’équipe Physico-chimie et dynamique des surfaces
Advancing Nanocrystal-based Infrared Imaging: Exploring Novel Strategies in the Design and Characterization
Unveiling Paris its PhD with Nanocristals in Infared Imaging
Abstract
The infrared region is a part of the electromagnetic spectrum with wavelengths longer than those of visible light. This spectral domain provides complementary information to the visible range, and finds application in various fields such as defense, astronomy, and emerging civilian technologies including LiDAR in autonomous vehicles, or face recognition in our smartphones. While the silicon-based sensing technology rules over the visible market, its equivalent has yet to be developed in the infrared. Colloidal nanocrystals offer a promising avenue for the realization of high-performance and cost-effective infrared sensors. These chemically synthetized crystalline objects exhibit quantum confinement effects, resulting in size-tunable optical properties. Among infrared absorbing nanocrystals, I have specifically used mercury chalcogenides (HgX) nanocrystals that can address the entire infrared range from the visible to the THz region. Over the course of my thesis, I have explored innovative concepts relating to both the material properties of nanocrystals and the design of complex device geometries with enhanced light-matter coupling. In particular, I have proposed different approaches to uncouple optical and transport properties in HgX-based photodetectors, aiming to achieve state-of-the-art sensing performances. Furthermore, I have pursued a novel strategy based on in-operando measurements, which focus on studying the material within the context of the device itself, rather than regarding them as separate entities.
Jury
M. Thierry TALIERCIO (IES, Montpellier) – Rapporteur
M. Hervé RINNERT (IJL, Nancy) – Rapporteur
M. Philippe GUYOT-SIONNEST (U.Chicago, Chicago) – Examinateur
Mme. Eva IZQUIERDO (Thales, Palaiseau) – Examinatrice
M. Christophe TESTELIN (INSP, Paris) – Examinateur
M. Grégory VINCENT (ONERA, Palaiseau) – Co-encadrant de thèse
M. Emmanuel LHUILLIER (INSP, Paris) – Directeur de thèse
