Acoustic Absorbing Metasurfaces (H/F)

The Institut Jean Lamour (IJL) is a joint research unit (UMR 7198) of CNRS and Université de Lorraine It is linked to the Institute of Chemistry of CNRS.
Focused on materials and processes science and engineering, it covers: materials, metallurgy, plasmas, surfaces, nanomaterials and electronics.
It regroups 183 researchers/lecturers, 91 engineers/technicians/administrative staff, 150 doctoral students and 25 post-doctoral fellows.
Partnerships exist with 150 companies and our research groups collaborate with more than 30 countries throughout the world.
Its exceptional instrumental platforms are spread over 4 sites; the main one is located on Artem campus in Nancy.
The project will be carried out within the “Metametarials and Phononics” grop whose subjects range from acoustic/elastic metamaterials and Phononics to topological and non-Hermitian metamaterials.

We are seeking for a brilliant PhD candidate to start a PhD project on Acoustic metamaterials/metasurfaces for low-frequency absorption to start on October 2021. Our group in the Institut Jean Lamour (IJL), Institution belonging to the University of Lorraine and CNRS, develops since many years different research topics related to acoustic/elastic metamaterials and metasurfaces, both on theoretical and experimental aspects. This has led to some majors achievements in the field of metamaterials [1-4]. The challenge of low-frequency acoustic absorption and elastic wave mitigation based on lightweight thin meta-structures has been one of the most exiting one we have faced, and with which we aim to cope in this proposed PhD project.
This PhD project is funded by Dassault Aviation in the context of the new common lab (LabCom Molière) regrouping, the IJL, IPCMS, CNRS and Dassault Aviation. This objective of this LabCom is to enhance and promote the collaboration between academic and industrial researches on materials science. More specifically, the proposed PhD project on acoustic metasurfaces for absorption will be one of the main foundations of this large LabCom Molière.
References :
1. M. B. Assouar, B. Liang, Y. Wu, Y. Li, J-C. Cheng & Y. Jing. Nature Reviews Materials 3, (2018) 460.
2. Y. Li & M. B. Assouar. Appl. Phys. Lett., 108 (2016) 063502.
3. Y. Zhu & M. B. Assouar. Phys. Rev. B, 99 (2019) 174109.
4. S. Qi, Y. Li & M. B. Assouar. Phys. Rev. Applied, 7 (2017) 054006.
Regarding the PhD thesis project, we propose to theoretically develop and experimentally demonstrate the concept of omnidirectional broadband thin metamaterial/metasurface for low-frequency absorption [50-500 Hz]. We, indeed, would like to develop a transformative approach by which we can implement these multi-functionality feature into a thin metastructure having different geometrical forms. To achieve this goal, numerical and theoretical platforms will be established in the first part of the PhD project as a first foundation. This will include the development of inverse design strategies based on deep-learning and Neural Networks approaches. The latters will then bring the project to the experimental track including the conception/design, fabrication and experimental analysis of the multifunctional metasurfaces