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Étude et application en micro-onde de l'hybridation de modes dans des systèmes localement résonants

Abstract : Development of photonic media, and more recently of metamaterials has drawn a new interest in acoustic and electromagnetic wave control. In this thesis, we propose an original approach of periodic lattice built with sub-wavelength resonators. Using electrodynamics analysis, we highlight collective phenomena of hybridization due to electromagnetic interactions. A model based on an approximation of resonators as electric and magnetic dipoles allows an analytical study. This approach must, on the one hand, be complementary to exciting models used to describe band gap apparition in locally periodic medium; and on the other hand, allow quantifying radiation properties of finite size media. This work has been applied to the design of a miniature antenna whose radiation pattern is controllable both in frequency and directivity. A sub-wavelength imaging device was also developed. It is based on the control of localized eigen-modes. Finally, hybridization properties of modes between half wavelength resonators are exploited to design an antenna dedicated to Magnetic Resonance Imaging. This antenna is used to generate and control the distribution of the radio-frequency magnetic field in the imaging volume which is a major challenge with the field rise of MRI.
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Submitted on : Tuesday, March 4, 2014 - 10:57:13 AM
Last modification on : Sunday, June 26, 2022 - 2:18:41 AM
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  • HAL Id : pastel-00955269, version 1


Camille Marguerite Jouvaud. Étude et application en micro-onde de l'hybridation de modes dans des systèmes localement résonants. Autre [cond-mat.other]. Université Paris-Diderot - Paris VII, 2013. Français. ⟨pastel-00955269⟩



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