Matthieu Davy

I have joined in 2007 the Institut Langevin for a Phd dedicated to the time-reversal method in electromagnetism. We have developed an “electromagnetic bazooka” and applied time reversal methods to microwaves mainly for imaging of people through the walls and subwavelength imaging.

As a post-doctoral researcher I have spent 1 year in Queens College and 6 months at the Institut Langevin. I have joined the IETR in 2012 as an assistant professor.

I have provided new insights into the transmission of waves through random media using the transmission matrix approach. This includes a full characterization of focusing through random media, statistics of transmitted intensity for single samples and profiles of the energy density inside the medium for a given transmission. I have worked on the ambient noise imaging technique with a fundamental study in multiple scattering media and its application for the first time to electromagnetism with thermal radiations. I also have contributed to the study of 3D SAR imaging for snow monitoring.

My current researchs are oriented toward the propagation of waves within complex media to design new systems for imaging. I combine both fundamental and applied physics. A first part of my activities is dedicated to the understanding of the transmission through multiple scattering media using the transmission matrix to control the energy density not only transmitted through the medium but also to enhance it inside. My works are also related to reverberation chambers to describe their degree of chaoticity at low frequencies with application to antenna characterization and radar cross-section measurements of objects. Secondly I am interesting in Radar imaging with both passive systems using thermal radiations in the microwave range and active systems. I develop new signal processing methods in electromagnetism including time reversal and the cross-correlation technique that make it possible to retrieve passively the impulse response between two receivers. I am currently supervising three Phd students.