Speakers > Aubry Alexandre

In wave imaging, we aim at characterizing an unknown environment by actively probing it and then recording the waves reflected by the medium. However, medium heterogeneities can induce wave-front distortions and multiple scattering events that can strongly degrade the resolution and the image contrast. In that context, we developed a universal matrix approach of wave imaging in heterogeneous media. A matrix formalism is actually the perfect tool to compensate for wave distortions. It also leads to the following paradigm shift in wave imaging: Whereas multiple scattering is generally seen as a nightmare, a matrix approach can take advantage of it for ultra-deep and high-resolution imaging. It is also a promising characterization tool since it can provide a high-resolution tomography of the wave velocity and transport parameters. All these concepts are applied to both optical microscopy (for in-depth imaging of biological tissues), ultrasound imaging (for medical diagnosis) and seismology (for monitoring of volcanoes and fault zones).