Etude et optimisation des caractéristiques de structures à nanomatériaux et métamatériaux.

Abstract

Study and optimization of the characteristics of nanomaterial and metamaterial structures. This present work aims to study periodic structures with metamaterials and nanomaterials. The first part is devoted to the characterization of periodic structures based metamaterial. Discussions have been initiated on the different classes of metamaterials and their corresponding applications. A reminder on materials and their different classes was proposed firstly, then on concrete realisations of metamaterial structures with negative permeabilities or permittivities. The most popular methods for the effective parameter extraction procedure were presented, moving from the classic Nicolson-Ross-Weir procedure to approaches derived from the NRW method. Different resonant structures were analyzed with the presented approaches, based on electromagnetic simulations with HFSS software. In the second part, a study of liquid sensor based on metamaterials was carried out. The optimization of a sensor based on metamaterials for the characterization and analysis of liquid and aqueous solutions of low concentration or volume was carried out leading to a sensor formed by a multispiral split-ring resonator coupled to a nonlinear micro-strip line. Two versions of sensors have been produced, the measurement results of which on mixtures of liquids and aqueous solutions in the presence of chemical species in very low concentrations have shown a high sensitivity comparable or even superior to the performances published recently. These structures also have miniaturized dimensions and a low manufacturing cost.