2-32 201
Hicham Mangach, post-doc de l’institut Fresnel
Abstract
Waves are an integral part of the physical world, influencing various phenomena and processes. Recently, the advent of man-made materials has enabled mechanical and optical wave’s manipulation in an extraordinary fashion. Since their initial demonstration, a wide range of wave-based phenomena and applications have been successfully demonstrated. These metamaterials display impressive effects, yet their diffraction remains constrained, similar to that of their photonic and phononic counterparts. Based on an anisotropic scaling effect, we significantly expand the spectral range by two and four orders of magnitude. As a result, we demonstrate the efficient transport of high-frequency photons for telecommunication purposes. Additionally, we demonstrate the existence of extraordinary states, including quasi-bound states in the continuum within photonic and metasurface designs. These findings have significant potential for the advancement of ultra-sensitive devices. In terms of mechanics, we have created a chiral metastructure capable of rotating mechanical polarization by 90 degrees via an in-plane rotation. We also show dispersive shear waves in two-dimensional structures with changing phase velocities. This enables us to perform elastodynamic transformation beyond conventional platonic methods.
