The objective of this project is to employ an alternative magnetic field to monitor the ability of micro-structured photonic surfaces to transmit or reflect light. The thermal power of magnetic nanoparticles (NPs) embedded in a composite silica material will be used to activate the thermo-chromic transition of vanadium dioxyde (VO2), through thermal transfer between both materials. A first part of the work will be devoted to the association of thin films of each material as multilayer devices, and the study of their magneto- chromic behavior: optical transmission and reflection when submitted to a magnetic field exposure. Then, the realization of microstructured surfaces exhibiting a resonant light reflection will be achieved with combined materials, in order to leverage from the resonant behavior, boost the magneto- chromic behavior and finally achieve a switch effect: full optical transmission versus full optical reflection of a light beam.
The PhD student will lead his/her work in the frame of a cooperation between two laboratories located in Saint Etienne: Hubert Curien (UMR CNRS 5516) concerning the experimental part relating to the elaboration of materials and devices (Sol-Gel, Pulsed-Laser-Deposition, photolithography) as well as the optical characterizations; Georges Friedel (UMR CNRS 5307) concerning the numerical simulation regarding the thermal properties of the nanocomposite, and the thermal transfer mechanisms inside the devices. Beyond applications in the field of functional optical surfaces, or biological micro-platforms with localized heating, the PhD student will also explore the direct magnetic steering of VO2 transition, as well as the measurement of the NPs proper temperature through magneto-optical analysis.
Funding category: Financement public/privé
EUR Manutech SLEIGHT
PHD title: Doctorat de Physique
PHD Country: FranceOffer Requirements Specific Requirements
To applicate to this funding, a Master's degree is required. The applicant should have received an education in the general field of Physics, especially in Optics and Physical properties of materials. Knowledge about magnetic materials, thermal diffusion or nanophotonics is an added value. She/He should demonstrate a motivation for experimental studies, as well as modelling using commercial codes. Speaking french is not essential but could be better. If not, english speaking is requiredContact Information