Reference : UMR5026-FREBON0-111
Workplace : PESSAC
Date of publication : Thursday, May 12, 2022
Scientific Responsible name : Thierry CARDINAL
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
The candidate will join the "Chemistry and photonics of oxide and fluoride materials" team of the ICMCB and the group of Younès Messaddeq at COPL in Canada. The program aims to develop a new generation of functional glasses transparent over a wide transparency window from visible to mid-infrared (up to 5 µm) and structured glassy materials with nonlinear and/or magneto-optical properties. The thesis program includes the definition of the compositions, the shaping of the materials and their study. The transmission at long wavelengths in glasses is limited by the multiphonon absorption of the compounds. The heavier the elements, the lower the phonon energy, and consequently, the more the multiphonon cutoff is pushed into the infrared. The germanate and gallate glass arrays extend the transmission window of oxide materials to the mid-IR at 5µm, which extends the field of use for chemical sensor applications or in the health field for example. The Franco-Quebec consortium has recently demonstrated that the introduction of rare earth ions such as lanthanum or yttrium opens up a wide window of composition for fiberization, for example.
An important work of synthesis (thermodynamics of the systems, phase diagrams, electronic and optical microscopy techniques) and physicochemical characterizations will be necessary to determine the most promising glassy compositions according to the introduced cations. The compatibility of these compositions with the purification techniques will have to be validated. It will also be necessary to analyze the structure of the glasses obtained in order to understand the particularity of germanate or gallate glasses allowing the introduction of high concentrations of rare earth ions for example. The combination of expertise in Bordeaux and Quebec will allow us to propose a complete study of the fabrication (synthesis and shaping) to the study of the magneto-optical or non-linear optical properties. Stretching methods for glassy multi-layers will be developed in order to combine optical and magneto-optical properties and to propose original solutions for material integration. The photosensitivity of materials will be explored to structure and print in three dimensions the optical and magnetic properties.
Finally, the close collaboration with teams in optics within the framework of the program financed by the Aquitaine region in France (Bordeaux, Limoges) and or Canada will allow to characterize the final optical properties.
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Founded in 1995, the lnstitute for Condensed Matter Chemistry of Bordeaux activities include both fundamental and applied research and focus on 3 domains : Solid State Chemistry, Materials Science and Molecular Science. ICMCB has extensive expertise in design, synthesis, shaping and characterisation of materials, with the goal to explore and optimise their functionalities. This wide scope and a large, complementary spectrum of methods available, generate fruitful synergies among our faculty (researchers, engineers and technical staff) - contributing to the outstanding reputation of the ICMCB.
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