Homogenization and metasurfaces

In collaboration with the LAUM laboratory (University of Le Mans) and the PMMH laboratory (ESPCI, Paris), we have developed a method for optically tracking waves on the surface of water, a method which allows us to resolve the wave field in time and space. In particular, this technique enables us to address the issue of wave turbulence: we need to understand how wave energy is distributed on spatial or frequency scales (known as an energy cascade), and how the spectral exponent depends on the conditions under which energy is injected into the system. With this method, we are also working to test the sensitivity of anisotropic structures (analogous to certain metamaterials studied in electromagnetism) to the specific features of waves at the water surface (dissipative, dispersive and non-linear).

Last but not least, by exploiting this technique, we recently carried out the first time-reversal experiment for waves propagating on the surface of water [1].