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Theses

Study of the nanostructured active cavities with photonic bandgaps

Abstract : In this thesis, a study of periodic microstructures and their applications to optical modulation by acoustical waves is presented. More specifically, it deals with opto-mechanical coupling in phoXonic crystal cavities. This study shows how the perturbation theory provides an efficient tool to analyse and predict the behaviour of modulation in such structures. Moreover, when compared to pure numerical ones, this method leads to calculation time saving. The theory of periodic media is first introduced and then we derive the parameters for the simultaneous existence of photonic and phononic bandgaps. We end up by the development of a semi-analytical method to analyze acousto-optical coupling efficiency in artificial periodic structures. The perturbation theory is developed up to 2nd order and is used together with symmetry considerations for interpretations. An illustration of the versatility of the developed method is presented using an L1 point defect cavity on silicon substrate and validated with classical numerical results.
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Submitted on : Wednesday, October 6, 2021 - 8:37:40 AM
Last modification on : Tuesday, October 19, 2021 - 3:07:28 PM

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  • HAL Id : tel-03367019, version 1

Citation

Abdallah El Soussi. Study of the nanostructured active cavities with photonic bandgaps. Electronics. Université de Valenciennes et du Hainaut-Cambrésis, 2019. English. ⟨NNT : 2019VALE0019⟩. ⟨tel-03367019⟩

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