Waves Theory and Mesoscopic Physics

Research topics

Wave propagation in correlated media
Speckle, information and wave control
Random lasers
Scattering and diffusion in atomic clouds
Quantum optics in complex media

News

Superresolved Imaging Based on Spatiotemporal Wave-Front Shaping Noetinger, G., S. Métais, G. Lerosey, M. Fink, S. M. Popoff, and F. Lemoult Physical Review Applied 19, no. 2 (2023) Abstract: A label-free approach to improving the performances of confocal scanning imaging is proposed. We experimentally demonstrate its feasibility using acoustic waves. It relies on a way to encode spatial information using the temporal dimension. By moving an emitter, used to insonify an object, along a circular path, we create a temporally modulated wavefield. Because of the symmetries of the problem, the spatiotemporal input field can be decomposed into harmonics corresponding to different spatial vortices. Acquiring the back-reflected waves with receivers that are also rotating, multiple images of the same object with different point spread functions are obtained. Not only is the resolution improved compared to a standard confocal configuration, but the accumulation of information also allows the building of images that beat the diffraction limit.
Super-localisation of a point-like emitter in a resonant environment: Correction of the mirage effect Baldassari, L., P. Millien, and A. L. Vanel Inverse Problems and Imaging 17, no. 2, 490-506 (2023) Abstract: In this paper, we show that it is possible to overcome one of the fundamental limitations of super-resolution microscopy: the necessity to be in an optically homogeneous environment. Using recent modal approximation results from [10, 7], we show, as a proof of concept, that it is possible to recover the position of a single point-like emitter in a known resonant environment from far-field measurements, with a precision two orders of magnitude below the classical Rayleigh limit. The procedure does not involve solving any partial differential equation, is computationally light (optimisation in Rd with d of the order of 10) and is therefore suited for the recovery of a very large number of single emitters.
Coherent backscattering of entangled photon pairs Safadi, M., O. Lib, H. C. Lin, C. W. Hsu, A. Goetschy, and Y. Bromberg Nature Physics (2023) Abstract: Correlations between entangled photons are a key ingredient for testing fundamental aspects of quantum mechanics and an invaluable resource for quantum technologies. However, scattering from a dynamic medium typically scrambles and averages out such correlations. Here we show that multiply scattered entangled photons reflected from a dynamic complex medium remain partially correlated. In experiments and full-wave simulations we observe enhanced correlations, within an angular range determined by the transport mean free path, which prevail over disorder averaging. Theoretical analysis reveals that this enhancement arises from the interference between scattering trajectories, in which the photons leave the sample and are then virtually reinjected back into it. These paths are the quantum counterpart of the paths that lead to the coherent backscattering of classical light. This work points to opportunities for entanglement transport despite dynamic multiple scattering in complex systems.
Reconstructing the Spatial Distribution of the Relative Shear Modulus in Quasi-static Ultrasound Elastography: Plane Stress Analysis Seppecher, L., E. Bretin, P. Millien, L. Petrusca, and E. Brusseau Ultrasound in Medicine and Biology (2023) Abstract: Quasi-static ultrasound elastography (QSUE) is an imaging technique that mainly provides axial strain maps of tissues when the latter are subjected to compression. In this article, a method for reconstructing the relative shear modulus distribution within a linear elastic and isotropic medium, in QSUE, is introduced. More specifically, the plane stress inverse problem is considered. The proposed method is based on the variational formulation of the equilibrium equations and on the choice of adapted discretization spaces, and only requires displacement fields in the analyzed media to be determined. Results from plane stress and 3-D numerical simulations, as well as from phantom experiments, showed that the method is able to reconstruct the different regions within a medium, with shear modulus contrasts that unambiguously reveal whether inclusions are stiffer or softer than the surrounding material. More specifically, for the plane stress simulations, inclusion-to-background modulus ratios were found to be very accurately estimated, with an error lower than 3%. For the 3-D simulations, for which the plane stress conditions are no longer satisfied, these ratios were, as expected, less accurate, with an error that remained lower than 10% for two of the three cases analyzed but was around 34% for the last case. Concerning the phantom experiments, a comparison with a shear wave elastography technique from a clinical ultrasound scanner was also made. Overall, the inclusion-to-background shear modulus ratios obtained with our approach were found to be closer to those given by the phantom manufacturer than the ratios provided by the clinical system.
Speckle Decorrelation in Fundamental and Second-Harmonic Light Scattered from Nonlinear Disorder Samanta, R., R. Pierrat, R. Carminati, and S. Mujumdar Physical Review Applied 18, no. 5 (2022) Abstract: Speckle patterns generated in a disordered medium carry a lot of information despite the apparent complete randomness in the intensity pattern. When the medium possesses ?(2) nonlinearity, the speckle is sensitive to the phase of the incident fundamental light, as well as the light generated within. Here, we examine the speckle decorrelation in the fundamental and second-harmonic transmitted light as a function of the varying power in the fundamental beam. At low incident powers, the speckle patterns produced by successive pulses exhibit strong correlations, which decrease with increasing power. The average correlation in the second-harmonic speckle decays faster than in the fundamental speckle. Next, we construct a theoretical model, backed up by numerical computations, to obtain deeper physical insights into the faster decorrelations in the second-harmonic light. While providing excellent qualitative agreement with the experiments, the model sheds light on the contribution of two effects in the correlations, namely, the generation of second-harmonic light and the propagation thereof.

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Theses, Scientific notes, Lecture notes

Collaborations

Habib Ammari, Department of Mathematics, ETH Zurich
Jacopo Bertolotti, University of Exeter
Élie Bretin, Pôle de Mathématiques, INSA Lyon
Yaron Bromberg, Complex Photonics Lab, The Hebrew University of Jerusalem
Hui Cao, Hui Cao Research Laboratory, Yale University
Aristide Dogariu, Photonics Diagnostics of Random Media, University of Central Florida
Antoine Canaguier-Durand, Quantum fluctuation and relativity, Laboratoire Kastler Brossel
Cristiano Ciuti, THEORIE Group, Laboratoire Matériaux et Phénomènes Quantiques
Dominique Delande, Complex Quantum Systems, Laboratoire Kastler Brossel
Ivan Favero, Dispositifs Optiques Nonlinéaires, Laboratoire Matériaux et Phénomènes Quantiques
Azriel Genack, Physics at Queens College, Queens College, New York
Sylvain Gigan, Optical imaging in biological and complex media, Laboratoire Kastler Brossel
Ori Katz, Advanced Imaging Lab, The Hebrew University of Jerusalem
Jean-Louis le Gouët, Processeurs atomiques et moléculaires dans les solides, Laboratoire Aimé Cotton
Allard Mosk, Nanophotonics, Utrecht University
Nadine Nassif, MHN Group, Laboratoire de Chimie de la Matière Condensée de Paris
Karsten Plamann, OPS Group, Laboratoire d’optique appliquée
Stefan Rotter, Nonlinear dynamics & Complex scattering, Vienna University of Technology
Sergey Skipetrov, Laboratoire de Physique et Modélisation des Milieux Condensés
Safran-Sagem
Saint-Gobain Recherche
Juan José Sáenz , Mesoscopic Physics Group, Donostia International Physics Center
Riccardo Sapienza, Complex Nanophotonics, King’s College London
John Schotland, Michigan Center for Applied and Interdisciplinary Mathematics, University of Michigan
Anne Sentenac, SEMO Group, Institut Fresnel
Laurent Seppecher, École Centrale de Lyon
Douglas Stone, Department of Applied Physics, Yale University
Kevin Vynck, Light in Complex Nanostructures, Institut d’Optique Graduate School, Bordeaux
David Wilkowski, Centre for quantum technologies, National University of Singapore

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Rémi CARMINATI

Tel.: +33 (0)1 80 96 30 72

Permanent staff

Rémi CARMINATI

Tel.: +33 (0)1 80 96 30 72

Arthur GOETSCHY

Tel.: +33 (0)1 80 96 39 46

Pierre MILLIEN

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Romain PIERRAT

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Sébastien POPOFF

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Postdoctoral fellows, teaching assistants and PhD students

Ahmed BEN AISSA

Tel.: +33 (0)1 80 96 33 42

Jérôme DON JAYAMANNE

Tel.: +33 (0)1 80 96 33 44

Clément DU BURCK

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David GASPARD

Tel.: +33 (0)1 80 96 33 89

Rodrigo GUTIERREZ CUEVAS

Tel.: +33 (0)1 80 96 33 40

Guillaume NOETINGER

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Romain RESCANIERES

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Past members

Alexandre SELVESTREL, Romain MONSARRAT, Julia ROCHA, Han CHEN, Mathieu DURAND, Maxime MATTHES, Alan PIETTE, Jean-Philippe BANON, Alexandra SHEREMET, Clotilde PROPHETE, Ugo TRICOLI, Nikos FAYARD, Dorian BOUCHET, Florian BIGOURDAN, Chang Chi KWONG, Olivier LESEUR, Diego BARESCH, Valentina PARIGI, Ibrahim BAYDOUN, Antoine CANAGUIER-DURAND, Da CAO, Marc DUBOIS, Nicolas BACHELARD, Alexandre CAZÉ, Kevin VYNCK, Étienne CASTANIÉ, Rémi VINCENT, Matthieu BOFFETY, Cédric VANDENBEM, Luis FROUFE-PEREZ, Hugues MARINCHIO

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Waves Theory and Mesoscopic Physics

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