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Elaboration et étude des propriétés électro-optiques de matériaux hybrides à base de nanocristaux de carbure de silicium

Abstract : The present work is devoted to the elaboration of hybrid materials based on host polymer matrices and silicon carbide nanocrystals (SiC) and to the investigations of their electro-optical properties. In this aim, SiC nanopowders with controlled features (size, structure) were synthesized by laser pyrolysis of gaseous mixtures (silane, acetylene). Suitable spectroscopic studies have revealed different surface states and allow us to select two representative SiC nanopowders. From controlled homogeneous SiC suspensions, SiC/polymer thin films were deposited by spin-coating. Relevant treatments (annealing, electrical poling) were realized to obtain composite films with good optical properties. The measurements of the effective electro-optical coefficients were carried out by the Sénarmont method in the dynamic regime where alternative voltage is used to probe the material birefringence. The systematic investigations, taking into account various parameters (SiC loading, surface state, nature of polymer, etc), revealed the key role played by the SiC/polymer interfaces on the electro-optical modulation of the composites. With effective linear electro-optical coefficients in the range 5-7 pm/V, i.e. in the order of the efficiency of standard electro-optical crystals, the potential application of the SiC/polymer hybrid systems as electro-optical modulator is demonstrated.
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https://tel.archives-ouvertes.fr/tel-00007825
Contributor : Johann Bouclé <>
Submitted on : Tuesday, December 21, 2004 - 11:09:13 AM
Last modification on : Tuesday, March 31, 2020 - 3:20:49 PM
Long-term archiving on: : Thursday, September 13, 2012 - 1:50:09 PM

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  • HAL Id : tel-00007825, version 1

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Johann Bouclé. Elaboration et étude des propriétés électro-optiques de matériaux hybrides à base de nanocristaux de carbure de silicium. Matériaux. Université du Maine, 2004. Français. ⟨tel-00007825⟩

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