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Étude et optimisations de jets photoniques pour des applications non conventionnelles dans les domaines optique et hyperfréquences

Abstract : The work of this thesis is devoted to the study and optimization of a particular case of the scattering of electromagnetic waves. Particularly, it is about a phenomenon called the "photonic jet or electromagnetic jet (EM jet)". This is a narrow light beam concentrated in near-field with remarkable physical characteristics. In this work, a waveguide terminated by a tip with special form is used to generate the photonic jet. This thesis performs the electromagnetic modeling, the experimental characterization and the optimization of photonic jets for applications in optic and microwave field. A robust and fast method was developed to calculate the electromagnetic field generated by a dielectric object or by a waveguide terminated with a tip. It is based on the boundary integral equation method (BIEM) which uses the second Green identity. Experimental characterization of photonic jets was conducted in the microwave field around 30 GHz. The ability to generate a single and double EM jet using a tipped waveguide has been shown experimentally and theoretically by BEIM method. The single and double EM jets were used for the detection of metal objects with a size smaller than the wavelength and for imaging through opaque structures in near field. An optimization procedure based on the coupling between the BEIM and genetic algorithms has been developed to generate photonic jets with properties well defined. Optimizations of photonic jets generated by a dielectric object and by a tipped waveguide have been realized for laser micro-etching and RF imaging
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Badreddine Ounnas. Étude et optimisations de jets photoniques pour des applications non conventionnelles dans les domaines optique et hyperfréquences. Optique [physics.optics]. Université Jean Monnet - Saint-Etienne, 2015. Français. ⟨NNT : 2015STET4009⟩. ⟨tel-01538810⟩



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