[FAMAS] Functional Materials for Acoustics

Latest News

April 1, 2017

Dr Yabin JIN will join us as a postDoc.

December 6, 2016

Adboulaye BA supported his doctoral thesis.

April 2016

Prof John H. PAGE visited us for a month, invited by Labex AMADEus.

Team members

Research topics

    [MAW] MAthematical theory of Wave propagation
    [RANDOM] RAtioNal Design Of Metamaterials
    [WIM] Wave propagation in Inhomogeneous Materials


programs subjects
    acoustic metamaterials, phononic crystals, multiple scattering, wave diffusion


Team members

Team leader: Olivier Poncelet

Team members

Christophe AristéguiFull Professor (UB)christophe.aristegui_AT_u-bordeaux.fr33 (0)5 40 00 31 02
Thomas BrunetAssociate Professor (Bordeaux INP)thomas.brunet_AT_u-bordeaux.fr33 (0)5 40 00 62 23
Olivier PonceletCNRS Researcherolivier.poncelet_AT_u-bordeaux.fr33 (0)5 40 00 21 91
AlexanderShuvalovCNRS Senior Researcheralexander.shuvalov_AT_u-bordeaux.fr33 (0)5 40 00 31 37
BenoitTallonPhD Studentbenoit.tallon_AT_u-bordeaux.fr33 (0)5 40 00 29 36


AlexanderDarinskiiVisitor 2016Russian Academy of Sciences (Russia)
Andrew N.NorrisVisitor 2008-2013Rutgers University (USA)
John H.PageVisitor 2016University of Manitoba (Canada)

Former team members

AbdoulayeBaPhD Student 2013-2016
MihaiCaleapPhD Student 2005-2009now at the Bristol University
Jérôme DuboisPhD Student 2008-2012now at l'Institut Langevin
Youssef El Hassouani Post-doc 2008-2009now at the Faculté des Sciences et Techniques ERRACHIDIA (Marocco)
Maria KorotyaevaPhD Student 2011-2014
AntonKutsenkoPost-doc 2010-2014now at UMR7359 GéoRessources, Université de Lorraine
Stas GolkinPhD Student 2005-2009now at NUMECA (Belgium)
Guillaume LepertPhD Student 2010-2013
Benoit MascaroPost-doc 2011-2015now at UMR5509 Laboratoire Mecanique des Fluides et d'Acoustique

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MAthematical theory of Wave propagation

Contact: Alexander Shuvalov

Section in construction

RAtioNal Design Of Metamaterials

Contact: Thomas Brunet


A promising way to control acoustic wave propagation (sound insulation, slow/fast waves…) is the use of metamaterials. These artificial materials, so called “locally-resonant materials”, get their unusual properties (super-absorbance, negative/zero index…) from strong scattering resonances of sub-wavelength particles exhibiting large mechanical contrasts with the surrounding medium. For various applications in the ultrasound domain, such an approach calls for the manufacture of 3D resonant structures at the micrometer scale. To do so, our physical chemistry colleagues from the University of Bordeaux (CRPP, LOF and LCPO) use soft-matter methods coupled with microfluidics to produce a large amount of micrometric resonators with various shapes, structures, and thus targeted mechanical properties (magnetic droplets, ultra-soft micro-beads, core-shell particles…). Then, the acoustic properties of these materials are experimentally characterized in our lab by means of various ultrasound techniques and compared to theoretical predictions derived in the framework of Multiple Scattering Theories.

Resonant emulsions

We investigate resonant scattering occurring in emulsions, composed of fluorinated oil droplets, exhibiting a wide collection of acoustic Mie resonances. Microfluidics allows the effective acoustic properties of such strongly scattering media to be precisely targeted by means of the production of calibrated (random) liquid-droplets: mean radius, size dispersion, and volume fraction. For polydisperse emulsions, we established a criterion for the emergence of resonances from the coherent acoustic field according to which the quality factor of a resonant mode has to be larger than one of the size distribution of the sample.

Related publications:
T. Brunet et al., Appl. Phys. Lett. 101, 011913 (2012)
B. Mascaro et al., J. Acoust. Soc. Am. 133 , 1996 (2013)

Tunable resonant emulsions

One advantage of all-fluid materials is the ability to be highly responsive to any external fields (e.g., magnetic, electric, and shear). We focused our attention on emulsions made of fluorinated ferrofluid droplets that can be easily deformed under uniform low intensity magnetic field. We showed that the elongation of initially spherical droplets into spheroids with moderate aspect ratio allows to reversibly tune both the dispersion and attenuation of the emulsion over a broad range of values.

Related publications:
T. Brunet et al., Phys. Rev. Lett. 111 , 264301 (2013)
K. Zimny et al., J. Mat. Chem. B 2 , 1285 (2014)

Soft 3D acoustic metafluids

We investigate the resonant response of suspensions composed of porous “ultra-slow” micro-beads, acting like Mie-type resonators. The simultaneous strong monopolar and dipolar resonances of these soft particles give a negative effective index (or phase velocity) to the suspension. Depending on the porous material within these particles (porous silicone rubber or porous silica xerogel), we have observed one or two negative bands, respectively.

Related publications:
T. Brunet et al., Science 342 , 323 (2013)
T. Brunet et al., Nat. Mater. 14 , 384 (2015)
S. Raffy et al., Adv. Mater. 28 , 1760 (2016)

Soft porous silicone rubbers

The porous material making up our micro-beads is often a soft porous silicone rubber exhibiting extremely low sound speeds (of tens of m/s), even for low porosities of the order of a few percent. This remarkable acoustic property makes this soft porous material an excellent candidate to produce efficient Mie-type resonators for acoustic metamaterials. Our ultrasonic experiments revealed a sudden drop of the longitudinal sound speed with the porosity, while the transverse sound speed remains constant.

Related publication:
K. Zimny et al., Langmuir 31, 3215 (2015)
A. Kovalenko et al., Soft Matter 12, 5154 (2016)
A. Ba et al., Sci. Rep. 7, 40106 (2017)

Wave propagation in Inhomogeneous Materials

Contact: Christophe Aristégui

Effective constitutive parameters

One way to obtain materials with a negative index is to achieve media with doubly negative constitutive parameters. We show that the double negativity required for perfect (non-dissipative) media is not necessary for real passive (lossy) metamaterials, for which single negativity of one of the two constitutive parameters may be sufficient. The analysis is presented through original diagrammatic representations involving both the real and imaginary parts of the dynamic constitutive parameters for isotropic media.

Related publications:
J. Dubois et al., J. Appl. Phys. 115, 024902 (2014)
T. Brunet et al., EPJ Appl. Metamat. 2 , 3 (2015)

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    BRENNUS (ANR-15-CE08-0024): Functional Acoustic Coatings with Soft Metamaterials, 2016-2019
    consortium led by I2M (Bordeaux), with CRPP (Bordeaux), LOF (Bordeaux)
    involved people: C. Aristégui, T. Brunet, O. Poncelet

    MIRAGES (ANR-12-BS09-0015): Active metamaterials and phononic crystals controlled by electric and magnetic fields, 2013-2015
    consortium led by IEMN (Lille), with THALES RT (Palaiseau), FANO (Le Havre) and I2M (Bordeaux)
    involved people: C. Aristégui, M. Korotyaeva, A. A. Kutsenko, O. Poncelet, A. L. Shuvalov

    METAKOUSTIK (ANR 2011 BS09 021 04): Rational Design of Bulk Ultrasonic Metamaterials, 2011-2015
    consortium led by CRPP (Bordeaux), with LOF-RHODIA-CNRS (Bordeaux), I2M (Bordeaux), LOMA (Bordeaux)
    involved people: C. Aristégui, T. Brunet, B. Mascaro, O. Poncelet

    SUPREME (ANR 08 BLAN 0101 01): Negative refraction superlens based on metamaterials and phononic crystals, 2009-2011
    consortium led by IEMN (Lille), with INSP (Paris), FANO (Tours & Le Havre) and LMP (Bordeaux)
    involved people: C. Aristégui, J. Dubois, A. A. Kutsenko, O. Poncelet, A. L. Shuvalov

Defense industry
    Toward ultrasonic tunable ultra-damping metamaterials, 2012-2013
    consortium led by CRPP (Bordeaux), with LOF-Rhodia-CNRS (Bordeaux), LCPO (Bordeaux) and I2M (Bordeaux)
    involved people: C. Aristégui, T. Brunet, B. Mascaro, O. Poncelet

    Acoustic metamaterials through a microfluidic, bottom-up approach: Toward highly attenuating, negative effective density materials, 2011-2012
    consortium led by CRPP (Bordeaux), with LOF-Rhodia-CNRS (Bordeaux) and I2M (Bordeaux)
    involved people: C. Aristégui, T. Brunet, B. Mascaro, O. Poncelet

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  • Soft porous silicone rubbers with ultra-low sound speeds in acoustic metamaterials
    A. Ba, A. Kovalenko, C. Aristégui, O. Mondain-Monval and T. Brunet,
    Scientific Reports 7, 40106 (2017)

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  • Soft 3D acoustic metamaterial with negative index
    T. Brunet, A. Merlin, B. Mascaro, K. Zimny, J. Leng, O. Poncelet, C. Aristégui and O. Mondain-Monval
    Nature Materials 14 (4), 384-389 (2015)

  • Negative-index metamaterials: is double negativity a real issue for dissipative media?
    T. Brunet, O. Poncelet and C. Aristégui
    EPJ Applied Metamaterials 2, 3 (2015)

  • Soft porous silicone rubbers as key elements for the realization of acoustic metamaterials
    K. Zimny, A. Merlin, A.Ba, C. Aristégui, T. Brunet and O. Mondain-Monval
    Langmuir 31 (10), 3215-3221 (2015)

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  • General formalism for plane guided waves in transversely inhomogeneous anisotropic plates
    A.L. Shuvalov, O. Poncelet and M. Deschamps
    Wave Motion 40 (4), 413-426 (2004)

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