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Theses

Diffusion Brillouin dans des fibres optiques étirées et microstructurées

Abstract : This PhD thesis focuses on the fundamental aspects of Brillouin scattering in chalcogenidemicrofibers and silica photonic crystal fibers with wavelength-scale solid core. Through experimentalinvestigations and numerical simulations, we have demonstrated that the Brillouin gain inchalcogenide microfiber can reach a value 150 to 250 times higher than in conventional opticalfibers. Moreover, we have reported the generation of multipeaked Brillouin spectra in a long taperedbirefringent photonic crystal fiber. A further investigation of these spectra shows that the multiresonantbehavior arises both from the excitation of hybrid acoustic waves and the fiber tapering.Another significant work of this thesis is the evidence of surface acoustic waves in small-core photoniccrystal fibers with large air filling fraction. Our results show specifically that this new type of scatteringis extremely sensitive to the air-hole microstructure geometry. Finally, these works contribute toa better understanding of Brillouin scattering in ultrathin optical fiber, paving the way towards therealization of new optoacoustic components for telecommunications and sensors.
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Joel Cabrel Tchahame Nougnihi. Diffusion Brillouin dans des fibres optiques étirées et microstructurées. Optique [physics.optics]. Université de Franche-Comté, 2016. Français. ⟨NNT : 2016BESA2049⟩. ⟨tel-01618497⟩

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