Nonlinear waves and Acoustics 

Research Prof. at CNRS 

Directeur de recherche au CNRS 

My research combines theoretical, computational and experimental methods for the study of nonlinear elastic and acoustic waves in materials and metamaterials. I look for a deeper insight into nonlinear wave processes in general, and seek to reveal new wave effects, or peculiar material properties... Applications range from nonlinear wave control by metamaterials (diode effect, absorption, mitigation...), to the characterization of materials by elastic waves and laser-generated ultrasonics. To learn more about my research projects, please go to the Research section.

Recent publications 


Research Scientist at CNRS, 2004-present 


 Currently Research scholar at Harvard University 

✔ PI and Director of École Universitaire de Recherche "Institut d'Acoustique - Graduate School", 2017 - 2022. 

✔ Elected member of section 9 of CoNRS, 2016-2021. 

✔ Manager of the international Master "Wave Physics & Acoustics" 2019 - 2022. 

✔ Leader of the team “Materials” of LAUM, 2007-2021. 

✔ Associate Editor for Acta Acustica and Applied Sciences. 

✔ Member of the Editorial Board of Ultrasonics. 

✔ Leader of the research group “Acoustics of granular media”, 2004-2009. 

✔ Member of CNU (Conseil National des Universités) section 60, 2007-2011. 



2016: Invited research scientist at Harvard University 

Bertoldi's Group, School of Engineering and Applied Sciences (SEAS), Harvard University 

Cambridge 02138, MA, USA 


2009: Habilitation thesis (HDR) 

“Nonlinear acoustics of granular media and other complex solids” 

Jury: Mathias Fink, Walter Lauriks, Paul A. Johnson, François Coulouvrat, Renaud Delaunay, Michel Bruneau, Vitalyi Gusev, Bernard Castagnède. 


2004: Post-doctoral fellow at Hokkaido University, Sapporo, Japan  

JSPS fellow (Japan Society for the promotion of Science) 

Applied Solid State Physics Laboratory, Faculty of Engineering, Department of Applied Physics (Prof. O. B. Wright & Prof. O. Matsuda). 

Laser picosecond ultrasonics, Ultrafast surface acoustic wave imaging 


2003: Ph. D thesis in Nonlinear Acoustics 

Laboratory of Acoustics at University of Maine, UMR CNRS 6613 

"Nonlinear acoustic self-demodulation process in granular media : theories and experiments" 

Supervision by V.E. Gusev and B. Castagnède 

Jury: Bernard Hosten, Daniel Royer, Xiaoping Jia, Frédéric Patat, Eric Pleska, Bernard Castagnède, Vitalyi Gusev. 


2000: Master's Degree 

Acoustics, Université du Maine, Le Mans, France 

Mention Très Bien, Title of the research project: "Multiple scattering of acoustic waves: effective medium theories" 

L. Jin, R. Khajehtourian, J. Mueller, A. Rafsanjani, V. Tournat, K. Bertoldi, D. M. Kochmann, Guided transition waves in multistable mechanical metamaterials, Proc. Natl. Acad. Sci. 201913228 (2020). PDF RG Movies 



Social media of Institut d'Acoustique - Graduate School 

Webinar given in the Meta Mat series on the 9th of February 2021.
"Nonlinear waves and flexible elastic metamaterials"

H. Yasuda, H. Shu, W. Jiao, V. Tournat, J. R. Raney, Nucleation of transition waves via collisions of elastic vector solitons,  Appl. Phys. Lett. 123, 051701 (2023). PDF

B. Deng, L. Chen, D. Wei, V. Tournat, K. Bertoldi, Pulse-driven robot: Motion via solitary waves, Science Advances 6 : eaaz1166  (2020). PDF RG