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Theses

Optimisation de cristaux photoniques pour l'optique non linéaire

Abstract : This thesis is a contribution to the theoretical and experimental studies on photonic crystals for use in non-linear optics. The aim of this PhD thesis is to demonstrate that controlling the physical parameters of these structures (periodicity, pattern, filling factor ...) makes feasible the engineering of the dispersion and can be advantageously used to enhance nonlinear interactions between light and matter. An important modelling work has been carried out to determine the electromagnetic field distribution in 1D limited structures. We have defined an effective global index which makes easier the phase matching condition determination, necessary for efficient second order non linear interactions. Modelling has been extended to planar structures (1.5D) and has allowed structuring a layer of GaN deposited on sapphire substrate for the exaltation of second harmonic generation : a first-step realization is presented. Moreover, we report a non-destructive characterization of planar two-dimensional (2D) photonic crystals made in silicon on insulator (SOI) wafers using ellipsometric or Fourier transformed infrared (FTIR) spectroscopy. These surface coupling techniques have enabled us to draw experimentally dispersion curves. Indeed, boundary conditions at the surface and at the border of the etched area of the slab, allow the excitation of guided modes via diffraction phenomena and the determination of the structure band diagram above and below the light cone. These non-destructive techniques, usable for non-active materials, allow fast characterization of technical processes and the location in reciprocal space of areas with unique dispersion properties to determine the best experimental conditions for observing nonlinear effects. This will be done in SOI when the holes are filled by a non-linear material (doped polymer). At large wavelengths, devices behave as homogeneous isotropic materials which can be characterized by an effective filling factor : experimental results using both methods give coherent results : The hole filling can then be checked by the methods developed here.
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https://tel.archives-ouvertes.fr/tel-00274814
Contributor : Yassine Benachour <>
Submitted on : Friday, May 2, 2008 - 2:33:02 PM
Last modification on : Friday, October 23, 2020 - 4:58:13 PM
Long-term archiving on: : Friday, November 25, 2016 - 10:16:35 PM

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  • HAL Id : tel-00274814, version 2

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Yassine Benachour. Optimisation de cristaux photoniques pour l'optique non linéaire. Physique [physics]. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00274814v2⟩

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