RISUD Research Seminar: Sound and Vibration Absorption and Mitigation based on Metastructures
Conference / Lecture
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Date
09 Sep 2025
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Organiser
Research Institute for Sustainable Urban Development (RISUD)
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Time
11:00 - 12:00
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Venue
Z509, 5/F, Block Z, PolyU & Online via Zoom Map
Enquiry
Kaley Li risud@polyu.edu.hk
Summary
Abstract
The ability to control, manipulate and structure sound and vibration with precision has long been a central goal in acoustics and mechanical engineering. Recent advances in the design of metastructures, engineered architectures with tailored wavelength or subwavelength features, have opened new frontiers in this pursuit. These structures enable unprecedented control over wave propagation, reflection, absorption, transmission and localization, far beyond the limits of conventional materials.
In this general seminar, Prof. ASSOUAR will present an overview of recent research developments in the field of acoustic and elastic metastructures, with a focus on how these architected materials can be used to structure and control sound and vibrations. More specifically, he will delineate the recent works he has developed on low-frequency sound and vibration absorption based on metastructures and discuss their underlying physics. He will present different absorbing metasurfaces exhibiting different properties and functionalities and discuss their added value as well as their limitations. He will also discuss some results on the non-locality effect on the absorption performances of metastructures, and how we can tackle on the broadband feature in low-frequency regime using this physical mechanism.
Biography
Director of Research & Professor,
French National Center of Scientific Research (CNRS),
University of Lorraine
Prof. 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 co-author of more than 165 international peer reviewed publications, in leading international journals including, Phys. Rev. Lett., Nature Review Materials, Advanced Materials, Nature Communications, 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 20 years, as indicated by the high citations rate his works has collected (11,000 citations, and h-index of 60).
