191 citations · 334 across the 19 of their papers we have counts for
20 papers
Observation of ultra-high-Q resonators in the ultrasound via bound states in the continuum
Mohamed Farhat, Younes Achaoui, Julio A. Iglesias Martinez +3
The confinement of waves in open systems represents a fundamental phenomenon extensively explored across various branches of wave physics. Recently, significant attention has been…
Bi-functional metamaterial based on Helmholtz resonators for sound and heat insulation
Brahim Lemkalli, Zine El Abiddine Fellah, Sébastien Guenneau +3
Over the last few decades, both heat and broadband sound reduction have become increasingly significant as a result of concerns about the environment and noise pollution. In order…
Clay metaBrick-based motif to enhance thermal and acoustic insulation
Brahim Lemkalli, Saad Bensallam, Muamer Kadic +4
Acoustic metamaterials have gained popularity as promising materials for enhancing noise reduction. Here, we explore the use of metamaterials, based on Helmholtz resonators (HRs),…
Subwavelength pulse focusing and perfect absorption in the Maxwell fisheye
Gautier Lefebvre, Marc Dubois, Younes Achaoui +4
Maxwell's fisheye is a paradigm for an absolute optical instrument with a refractive index deduced from the stereographic projection of a sphere on a plane. We investigate experime…
Polarization State Conversion through Chiral Butterfly Meta-Structure
Hicham Mangach, Younes Achaoui, Muamer Kadic +3
The recent emergence of chirality in mechanical metamaterials has revolutionized the field, enabling achievements in wave propagation and polarization control. Despite being an int…
Symmetrical Anisotropy Enables Dynamic Diffraction Control in Photonics
Hicham Mangach, Youssef El Badri, Abdenbi Bouzid +2
Despite the steady advancements in nanofabrication made over the past decade that had prompted a plethora of intriguing applications across various fields, achieving compatibility…
The emergence of low-frequency dual Fano resonances in chiral twisting metamaterials
Brahim Lemkalli, Muamer Kadic, Youssef El Badri +3
In the current work, through a finite element analysis, we demonstrate that a configuration of chiral cells having syndiotactic symmetry provides dual Fano resonances at low freque…
Longitudinal-Twist Wave Converter based on Chiral Metamaterials
Brahim Lemkalli, Muamer Kadic, Youssef El Badri +3
Advances in material architectures have enabled endowing materials with exotic attributes not commonly available in the conventional realm of mechanical engineering. Twisting, a me…
Mapping of Elastic Properties of Twisting Metamaterials onto Micropolar Continuum using Static Calculations
Brahim Lemkalli, Muamer Kadic, Youssef El Badri +3
Recent developments in the engineering of metamaterials have brought forth a myriad of mesmerizing mechanical properties that do not exist in ordinary solids. Among these, twisting…
Cloaking in-plane elastic waves with swiss rolls
Younes Achaoui, Andre Diatta, Muamer Kadic +1
We propose a design of cylindrical elastic cloak for coupled in-plane shear waves consisting of concentric layers of sub-wavelength resonant stress-free inclusions shaped as swiss-…
Seismic wave shield using cubic arrays of split-ball resonators
Bogdan Ungureanu, Younes Achaoui, Stephane Brule +3
Metre size inertial resonators located in the ground have been theoretically shown to interact with a seismic wave (attenuation, band gaps) to enable protection of surface structur…
The influence of building interactions on seismic and elastic surface waves
Bogdan Ungureanu, Sébastien Guenneau, Younes Achaoui +6
We outline some recent research advances on the control of elastic waves in thin and thick plates, that have occurred since the large scale experiment [Phys. Rev. Lett. 112, 133901…
Non-Euclidean elastodynamic cloaking theory and application to control of surface seismic waves with pillars atop a thick plate
Andre Diatta, Younes Achaoui, Sebastien Guenneau
In [AIP Advances 6, 121707 (2016)], a soil structured with concrete columns distributed within two specially designed seismic cloaks thanks to a combination of transformational ela…
Elastic wave control beyond band-gaps: shaping the flow of waves in plates and half-spaces
Andrea Colombi, Richard Craster, Daniel Colquitt +4
It is well known in metamaterials that local resonance and hybridization phenomena dramatically influence the shape of dispersion curves; the metasurface created by a cluster of re…
Clamped seismic metamaterials: Ultra-low broad frequency stop-bands
Y. Achaoui, T. Antonakakis, S. Brule +3
The regularity of earthquakes, their destructive power, and the nuisance of ground vibration in urban environments, all motivate designs of defence structures to lessen the impact…
Control of Rayleigh-like waves in thick plate Willis metamaterials
Andre Diatta, Younes Achaoui, Stéphane Brûlé +2
We explore interactions of elastic waves propagating in plates (with soil parameters) structured with concrete pillars buried in the soil. Pillars are 2 m in diameter, 30 m in dept…
Seismic waves damping with arrays of inertial resonators
Younes Achaoui, Bogdan Ungureanu, Stefan Enoch +2
We investigate the elastic stop band properties of a theoretical cubic array of iron spheres connected to a bulk of concrete via iron or rubber ligaments. Each sphere can move free…
Auxetic-like metamaterials as novel earthquake protections
Bogdan Ungureanu, Younes Achaoui, Stefan Enoch +2
We propose that wave propagation through a class of mechanical metamaterials opens unprecedented avenues in seismic wave protection based on spectral properties of auxetic-like met…
Steering in-plane shear waves with inertial resonators in platonic crystals
Younes Achaoui, André Diatta, Sébastien Guenneau
Numerical simulations shed light on control of shear elastic wave propagation in plates structured with inertial resonators. The structural element is composed of a heavy core conn…
Experiments on Maxwell's Fish-eye dynamics in elastic plates
Gautier Lefebvre, Marc Dubois, Romain Beauvais +3
We experimentally demonstrate that a Duraluminium thin plate with a thickness profile varying radially in a piecewise constant fashion as h(r)=h(0)(1+(r/Rmax)), with h(0)=0.5 mm, h…