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Theses

Guidage et filtrage des ondes dans les cristaux phononiques

Abstract : This thesis has been conducted within the département LPMO of the institut FEMTO-ST, under the supervision
of Vincent Laude and Abdelkrim Khelif. It has been devoted to the study of wave propagation in elastic band gap materials, the so-called phononic crystals.
In the first part of this work, filtering, guiding and coupling phenomena in low operating frequency bulk wave phononic crystals consisting of an arrangement of millimeter-sized steel rods immersed in water have been investigated. Complex functions like band gap tunability or wavelength demultiplexing have proven to be achievable in such structures.
The second part has been aiming at demonstrating the possibility of implementing band gap properties for surface waves in two-dimensional phononic crystals with an operating frequency of the order of a few hundreds of megahertz. Micron-sized holes have been etched both in lithium niobate and in silicon using clean room processes to allow for the fabrication of the periodical structures which have been characterised by electrical as well as by optical techniques. A full band gap for surface acoustic waves has been found, in close agreement with the theoretical predictions.
Eventually, the third part of this thesis has dealt with a preliminary theoretical study of acousto-optical interactions
in artificial materials exhibiting both photonic and phononic band gap properties. This study has highlighted the formalism-pertaining issues encountered when dealing with highly and simultaneously confined acoustic and optical modes.
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Contributor : Sarah Benchabane <>
Submitted on : Thursday, April 5, 2007 - 8:49:10 PM
Last modification on : Thursday, November 12, 2020 - 9:42:06 AM
Long-term archiving on: : Friday, September 21, 2012 - 1:55:24 PM

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  • HAL Id : tel-00140347, version 1

Citation

Sarah Benchabane. Guidage et filtrage des ondes dans les cristaux phononiques. Acoustique [physics.class-ph]. Université de Franche-Comté, 2006. Français. ⟨tel-00140347⟩

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