Théorie des ondes (TDO)

Exemple de mode diffus (gauche) et localisé (droit) dans un milieu désordonné corrélé

Figure de speckle au sein d'un milieu désordonné générée numériquement

Réseau désordonné hyperuniforme de points. Une fois habillé par des diffuseurs matériels, cet ensemble présente des propriétés optiques remarquables (transparence, absorption, localisation).

Responsable

Arthur GOETSCHY

Tél. : 01 80 96 39 46

Co-responsable

Romain PIERRAT

Tél. : 01 80 96 30 70

Membres permanents

Rémi CARMINATI

Tél. : 01 80 96 30 72

Marcel FILOCHE

Tél. : 01 80 96 30 82

Arthur GOETSCHY

Tél. : 01 80 96 39 46

Agnès MAUREL

Tél. : 01 80 96 30 71

Pierre MILLIEN

Tél. : 01 80 96 30 51

Romain PIERRAT

Tél. : 01 80 96 30 70

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Actualités

Enhanced quantum correlations from joint pump and photon pair scattering Safadi, M., N. Kuchuk, O. Lib, Y. Bromberg, and A. Goetschy APL Photonics 11, no. 6 (2026) Résumé: Scattering of non-classical light is enabling new ways to study and control photon transport. However, advances in this field often rely on simplifying assumptions regarding the quantum light’s generation and its source. In this work, we relax some of these assumptions and probe the behavior of entangled photon pairs passing through a disordered layer after being generated by a randomly scattered pump via spontaneous parametric down-conversion. We experimentally demonstrate that when the photon pairs are generated immediately after the pump is scattered, they retain a sharp angular correlation peak even after propagating through a dynamic scattering medium. Beyond this proof-of-principle experiment, we present a comprehensive theoretical and numerical analysis showing that these correlations persist for arbitrary separations between the pair-generation region and the entrance to the disordered medium, with qualitatively distinct behavior depending on whether scattering occurs before or after pair generation. In particular, we analyze how the width and strength of the angular correlations depend on the distance between the generation region and the disordered layer. When the pairs are generated after the pump is scattered, the correlation width increases with distance, while the correlation strength remains approximately constant. In contrast, when the pairs are generated first and subsequently scattered, the correlation width initially broadens and then narrows, accompanied by a modification in correlation strength. These findings represent a crucial step toward understanding quantum light generation in complex media and potentially exploiting it for quantum technologies.
Modified Luneburg Lens: How Well Does It Focus Surface Water Waves? Pichard, H., A. Maurel, P. A. Martin, P. Petitjeans, and V. Pagneux Fluids 11, no. 6, 145 (2026) Résumé: An optical lens focuses light and a similar device can be developed to focus surface water waves. A detailed description of such hydrodynamic lenses is given, for which the focusing is induced by shaping the bathymetry of the bottom. Classically, the Luneburg lens uses a specific radial variation of the refractive index. The modified Luneburg lens (MLL) introduces an extra degree of freedom, permitting the focal point to be tuned. It is shown how to design the MLL for water waves, and then its performance is evaluated. Compared with a simple parabolic-shaped mount, the MLL is shown to be free of spherical aberration, resulting in a focus with larger intensity and smaller size of the focal point. Moreover, the focusing properties can be tuned and enhanced thanks to the possibility of changing the position of the focal point. The focusing quality of the MLL is described in all water-depth regimes (covering dispersive and non-dispersive waves) and the focusing of linear and nonlinear waves is revealed experimentally. The option of moving the focal point outside the lens, where the water depth is constant, may be useful when locating devices for harvesting wave energy.
Urban Seismology: A Homogenization Perspective on Site–City and Site–Foundation–City Interaction Maurel, A., K. Pham, J. F. Semblat, and S. Félix Bulletin of the Seismological Society of America 116, no. 2, 535-552 (2026) Résumé: We revisit site–city interaction (SCI) within the framework of a two-scale homogenization model verified through direct numerical simulations for an idealized geometry consisting of an infinite city and sedimentary basin. The proposed model extends previous investigations by systematically accounting for the collective influence of buildings on seismic wave propagation. We further generalize the homogenization approach to incorporate building foundations at various depths, highlighting their impact on resonance phenomena. These findings provide new insights into urban seismic wavefield and offer a simplified yet effective framework for assessing city–scale wave motion in complex site–foundation–city configurations.
Localization-landscape generalized Mott-Berezinskiĭ formula Hayoun, G., I. A. Gruzberg, and M. Filoche Physical Review B 113, no. 10 (2026)

> Toutes les publications...

Présentation du thème

Nos activités théoriques (modélisation, approches analytiques et statistiques, simulations numériques) visent à comprendre les propriétés des ondes (optiques, acoustiques, électroniques) dans leurs interactions avec la matière et leur propagation. Ces activités couvrent 3 grandes thématiques : l’étude de systèmes complexes par nature (tissus biologiques, semi-conducteurs désordonnés, fibres multi-modes, cavités chaotiques, réseaux) ; le contrôle de la complexité des matériaux (désordre corrélé, résonance locales, milieux dépendant du temps) ; et le contrôle des ondes (spatial, spectral pour les ondes classiques, nature de l’état pour les ondes quantiques).

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Collaborations actives

Habib Ammari, Department of Mathematics, ETH Zurich
Geoffroy Aubry, Institut de Physique de Nice
Jean-Philippe Banon, Laboratoire Charles Fabry, Institut d’Optique Graduate School
Élie Bretin, Pôle de Mathématiques, INSA Lyon
Yaron Bromberg, Complex Photonics Lab, The Hebrew University of Jerusalem
CEA DAM
Hui Cao, Hui Cao Research Laboratory, Yale University
Nicolas Cherroret, Complex Quantum Systems, Laboratoire Kastler Brossel
Hilton de Aguiar, Optical imaging in biological and complex media, Laboratoire Kastler Brossel
Aristide Dogariu, Photonics Diagnostics of Random Media, University of Central Florida
Sylvain Gigan, Optical imaging in biological and complex media, Laboratoire Kastler Brossel
Wade Hsu, Optics in Complex Systems, USC
Ori Katz, Advanced Imaging Lab, The Hebrew University of Jerusalem
Fabrice Mortessagne, Institut de Physique de Nice
Sushil Mujumdar Nano-Optics & Mesoscopic Optics Laboratory, TIFR

Vincent Pagneux, LAUM, Le Mans
Philippe Petitjeans, PMMH, ESPCI Paris - PSL
Kim Pham, LMI, ENSTA Paris
Stefan Rotter, Nonlinear dynamics & Complex scattering, Vienna University of Technology
L’Oréal
Saint-Gobain Recherche
Riccardo Sapienza, Complex Nanophotonics, King’s College London
Frank Scheffold, Soft Matter Photonics, University of Fribourg
John Schotland, Department of Mathematics, Yale University
Laurent Seppecher, École Centrale de Lyon
Boris Shapiro, Technion
Simons collaboration on Localization of Waves
Ingve Simonsen, NTNU, Trondheim
Douglas Stone, Department of Applied Physics, Yale University
Nicolas Treps, Quantum Optics group, Laboratoire Kastler Brossel
Damien Vandembroucq, PMMH, ESPCI Paris - PSL
Silvia Vignolini, Max Planck Institute of colloids and interfaces, Potsdam
Kevin Vynck, Institut Lumière Matière, Lyon
Alexey Yamilov, METIS group, MST
Hasan Yılmaz, Bilkent University

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