Doctorant sous la direction de D. LESSELIER

Titre de la thèse: Resonant micro-structured 3-dimensional antenna systems, imaging and super-resolution
Résumé de la thèse: How to prove and characterize the effictive super-resolution of a particular radiating element of a micro-structure is the main goal of the investigation. The idea behind it is that one should reach a better resolution with respect to the wavelengths of the radiation from a far-field observation followed by some proper back-propagation onto the relevant domain within which the sources and per extension the whole structure are located (with no or litte information on the radiating element, nature and localization as well). This is linked with time-reversal concepts already considered in (scalar) acoustics and further explained in the applied mathematics community via the example of 2-D Helmholtz resonators, while, in parallel, again in a similar 2-D scalar situation, resolution enhancement invoving honogenization can be exhibited. Results in the vector-wave 3D situation of our interest requires extensive expertise and sustained effort: (i) in computational fashion, we are interested in partially periodic structures of limited extent, open or partially open, in particular with facing vector wave field equations so as to get Green dyads in complex pseudo-cavity regime;(ii) in more pratical terms -- we must take into account the realization constraints of se-ups,the need of wideband measurements or transient measurement systems;(iii) in terms of understanding of observed results, which remain quite controversial in the communities of antennas and inversion.