A5001087794- Random lasers and scattering media
- Acoustic Wave Phenomena Research
- Ultrasonics and Acoustic Wave Propagation
- Quantum optics and atomic interactions
- Terahertz technology and applications
- Photonic Crystals and Applications
- Quantum and electron transport phenomena
- Numerical methods in inverse problems
- Thermal properties of materials
- Speech and Audio Processing
- Aerodynamics and Acoustics in Jet Flows
- Hearing Loss and Rehabilitation
- Underwater Acoustics Research
- Nonlinear Photonic Systems
- Diffusion and Search Dynamics
- Seismic Waves and Analysis
- Music Technology and Sound Studies
- Quantum chaos and dynamical systems
Le Mans Université
2019-2022
Centre National de la Recherche Scientifique
2019-2022
Laboratoire d'Acoustique de l'Université du Mans
2019
Institut National des Sciences Appliquées Rouen Normandie
2016
By varying the degree of correlation in stealthy hyperuniform (SHU) materials, continuous evolution from uncorrelated disorder to periodic media is possible and allows us, as such, study fate bimodal distribution, characteristic a diffusive transport. Considering wave transport through SHU distribution given number scatterers at frequency, transition transparent medium clearly observed only below Bragg frequency. This characterized by threshold value stealthiness vicinity which material...
Stealthy hyperuniform point patterns are characterized by a vanishing spatial Fourier transform around the origin of reciprocal vector space. The long-range density fluctuations suppressed as well in materials consisting such distribution scatterers, opening up opportunities to control waves. Beside wave transport structured driven several elements, acoustic properties host material, scatterer characteristics, i.e., dimensions or resonant features, and patterns. effects these three basic...
Abstract Over the past 3 decades, phononic crystals experienced revolutionary development for understanding and utilizing mechanical waves by exploring interaction between structures. With significant advances in manufacture technologies from nanoscale to macroscale, attract researchers diverse disciplines study abundant directions such as bandgaps, dispersion engineering, novel modes, reconfigurable control, efficient design algorithms so on. The aim of this roadmap is present current state...
Two-dimensional stealthy hyperuniform distributions of rigid scatterers embedded in a waveguide are experimentally characterized the wave transport properties for scalar waves airborne audible acoustics. The non resonant nature allows us to directly links these geometric distribution points through structure factor. analyzed as function stealthiness $\chi$ their point pattern and compared those disordered material diffusive regime, which by Ohm's law mean free path. Different scattering...
We report on a significant and broadband enhancement of the transmission through an opaque barrier, when placed between symmetric diffusive disordered slabs. The is accompanied by bimodal distribution eigenvalues, and, for given transmittance it finds optimal value particular length A simple model allows us to quantify scalings parameters that show stronger maximum possible enhancement. sensitivity symmetry defects also explored, displaying potential interest wave based sensing.Received 16...
We demonstrate in microwave measurements the broadband enhancement of transmission through an opaque barrier due to mirror symmetry. This relies on constructive interference between scattering paths resulting from strong internal reflections at left and right interfaces a multichannel cavity. observe sensitivity conductance shift center Remarkably, impact symmetry can be further increased by tuning degree disorder within report additional found symmetrically placing randomly located...
We observe a broadband and subwavelength sensitivity of the recently reported enhanced transmission through symmetric diffusive slabs [Ch\'eron et al., Phys. Rev. Lett. 122, 125501 (2019)]. From perfectly distribution scatterers on both sides an opaque barrier within waveguide, shift as small $\ensuremath{\lambda}/200$ significantly alters multiple interferences giving rise to enhancement, this appears very broad frequency range without averaging. Analyses, from either full wave numerics or...
Abstract We inspect the robustness to absorption and symmetry defects of symmetry-induced broadband enhancement through opaque barriers in disordered slabs. The sensitivity this phenomenon is found be strongly related distance from barrier nearest defect, and, following, we propose a probabilistic model estimate conductance medium with an arbitrary number randomly distributed defects. Also, shown robust medium, though being course weakened. For sufficiently barriers, conditions optimal are...
The aim of this work is to present an experimental validation in-flow beamforming using vibration measurements. An antenna accelerometers mounted on a thin structure placed in the flow. High wavenumbers turbulent boundary layer are naturally filtered out by structure, such that mainly dominated acoustic part excitation. inverse method used reconstruct pressure exciting from measurements, then injected code. experiment shows ability excitation, and validates possibility use it for source localisation