Structuring Sound and Vibration by Metasurfaces
This seminar provides an overview of recent research on acoustic and elastic metasurfaces and metamaterials, covering their fundamentals, applications in wave and vibration control, including low-frequency absorption, BIC physics, and phonic skyrmions.
Overview
Acoustic metasurfaces have added value and unusual functionalities compared with their predecessor in materials science, namely, acoustic metamaterials. These rationally designed 2D materials of subwavelength thickness provide a new route for sound wave and vibration manipulation. Building on the success of bulk metamaterials in the past decade, acoustic metasurfaces have significantly advanced the field of wave manipulation and structuration, enabling the design of miniaturized materials and devices with complex and unprecedented functionalities. One of the main reasons for the interest in acoustic metasurfaces is the challenge of using bulk acoustic metamaterials to manipulate the sound of long wavelengths in air and water. The use of metasurfaces, in the form of thin and lightweight structures, is an ingenious way to overcome this problem.
In this general seminar, I will present a brief overview on some recent researches on acoustic and elastic metasurfaces and metamaterials for controllable wave and vibration structuration. I will first delineate some fundamentals aspects of these architected materials, and emphasize their functionalities and potential applications. Then, I will present some recent works we have developed on low-frequency absorption1-3, BIC4-6 physics and applications and the new physical concept of phonic skyrmions7. I will talk about related applications and their implementation in real environments.
Presenters
Badreddine Assouar, Professor, Director of Research at French National Center of Scientific Research (CNRS), University of Lorraine, France
Brief Biography
Professor Badreddine Assouar received his PhD degree in Materials Physics from Nancy University in France in 2001. In 2002, he became a Research Scientist at “Centre National de la Recherche Scientifique (CNRS)” in France. He obtained his habilitation to supervise research (HDR) in 2007 and became a Research Professor. In 2010, he joined Georgia Institute of Technology in USA as visiting Professor, where he spent 2 years, developing researches on metamaterials. He afterwards founded the “Acoustics Metamaterials and Phononics” group at the University of Lorraine where he is developing researches on acoustic/elastic metamaterials, metasurfaces, phononics and wave physics. He is currently a Director of Research at the CNRS, and since 2021 the Director of the LABCOM MOLIERE, a joint industrial-academic research unit focused on innovative functional materials for aeronautics. In 2024, Prof. Assouar has been elected a Fellow of the European Academy of Sciences. He is also serving as Associate Editor with Physical Review Applied since 2019.
Prof. Assouar is author or or co-author of more than 160 international peer reviewed publications, in leading international journals including, Phys. Rev. Lett., Nature Communications, Nature Review Materials, Advanced Materials, Science Advances, Phys. Rev. Applied …, and more than 50 invited talks and keynotes over the world. This has led to highly recognition of his works and achievements over the past 15 years, as indicated by the high citations rate his works has collected (>10700 citations, and h-index of 58).
