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Advanced Concepts of Metamaterials for Electromagnetism and Photonics

Abstract : Metasurfaces allows an effective control of electromagnetic radiation by manipulating phase, amplitude and polarization of electromagnetic waves. For numerous applications including tunable, switchable and sensing functionalities, high performance metasurfaces are required. The goal of this thesis is to explore innovative methods enabling to improve the quality factors of metasurfaces in microwave and optical domains. The limitation of metasurfaces is generally related to radiation losses and non-radiative absorption. The study is focused on solutions allowing the suppression of radiative losses by using concepts of dark mode and Fano resonance. A direct dark mode excitation mechanism in individual resonator based on symmetrymatching is proposed. The possibility to enhance magnetic response efficiency in optical frequency range is presented. Analysis of Fano resonance excitation in a system of identical coupled resonators is also performed on the basis of coupled mode theory formalism. Two general configurations are considered corresponding to symmetric and enantiomeric space arrangement of resonators. In the first case, cavity system formed by near-field coupled metasurfaces provides sharp spectral characteristics and high efficient sensitivity compared to conventional Fabry-Perot cavities. In the second case the design features enables to control suppression of radiation losses, allowing to considerably increase Fano resonance quality factor.
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Elena Bochkova. Advanced Concepts of Metamaterials for Electromagnetism and Photonics. Optics / Photonic. Université Paris Saclay (COmUE), 2017. English. ⟨NNT : 2017SACLS441⟩. ⟨tel-01968035⟩

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