PhD defense Van Doan Le"Study on the optical properties of metal-dielectric nanocomposite materials induced by laser"

"Study on the optical properties of metal-dielectric nanocomposite materials induced by laser"

Abstract:

Structural color arises from the interaction between light and nanostructured materials. The ability to control the structural colors of nanomaterials has generated significant interest in metasurface research due to their potential for a wide range of industrial applications, such as vision, display technologies, data encoding, and anti-counterfeiting. However, scaling up production presents a major challenge for customizing the metasurfaces. Laser-based techniques offer a potential approach to overcome such challenge owning to the simplicity, cost-effectiveness and scalability. Nonetheless, the laser-induced materials typically suffer from intrinsic imperfections, including variable particle sizes, imperfect organization, and different surface morphologies. The optical responses of the material are thus characterized by their statistical properties, making the researches in color properties challenging. This thesis investigates the optical properties of mesoporous TiO2 thin films impregnated with small silver particles deposited on glass substrates processed by lasers. The main objectives of this thesis are to understand how structural inhomogeneities affect the optical properties of the materials and the mechanisms that lead to different diffracted and dichroic properties arising from their statistical properties.

Jury:

• Prof. Davy Gerard, UTT, France; Reviewer
• Dr. Kevin Vynck, CNRS researcher, ILM, France; Reviewer
• Dr. Béatrice Dagens, CNRS researcher, Université Paris-Sud 11, France; Examiner
• Prof. Mathieu Hébert, UJM, France; Examiner
• Prof. Nathalie Destouches, UJM, France; Supervisor
• Dr. Myriam Zerrad, Institut Fresnel, France; Co-supervisor
• Dr. Nicolas Dalloz, Innovation engineer, HID global, France; Invited