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Exaltation des Non Linéarités du Troisième Ordre dans les Structures à Cristal Photonique

Magali Astic 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Manolia
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Due to their original light propagation properties, photonic crystal structures allow to realize high quality and small dimension devices for all optical classical and quantum signal processing. The aim of this work is to show the enhancement of third order non linearities in photonic crystals and to favour, thanks to theoretical modelling and practical experiments, the comprehension of this amazing process. We point out that the clue resides in the great ability of photonic crystals to localise light at the photonic band edge. This phenomenon, directly linked to the slowing of light inside the structure, is very beneficial to favour non linear interactions. Theoretically, we have studied, thanks to a matrix formalism extended to non linear case of four wave mixing, several 1D structures. We showed the high enhancement of the conjugated reflectivity at the photonic band edge, this one is directly linked to the high localisation of light at this wavelength. The structural parameters favouring this localisation are also high lightened. Several spectroscopic and time resolved studies on 1D structures with low (PC II-VI) or high (PC III-V) index contrast have been realised. They have showed that very high free carriers densities photo generated by multi photonic absorption are extremely favoured at the photonic band edge. We also studied 2D structures using serial Fourier decomposition of the 2D grating and we compared performances of the tilted 1D photonic crystal and of the 2D photonic crystal.
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Submitted on : Wednesday, March 23, 2011 - 10:34:34 AM
Last modification on : Wednesday, October 14, 2020 - 3:56:43 AM
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  • HAL Id : tel-00579136, version 1

Citation

Magali Astic. Exaltation des Non Linéarités du Troisième Ordre dans les Structures à Cristal Photonique. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00579136⟩

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