Semi-conducting silicon carbide nanocrystals (ncSiC) are promising materials due to their tunable electronic and optical properties. The grain sizes, crystalline polytypes, surface states and defect content play a key role in the physical response of the particles. To take advantage of the nanosized crystal properties, functional hybrid materials based on ncSiC incorporated in an organic host are developped. In this context, it was recently shown that the incorporation of SiC nanocrystals (10-30 nm) in polymer matrix leeds to an enhancement of the second- and third-order nonlinear optical susceptibilities of the nanocomposite.
This work is devoted to the electro-optical effect of such kind of nanocomposites (e.g. application as Pockels modulators). The different steps of the elaboration process were developped and improved. This include the ncSiC synthesis by laser pyrolysis, the particle dispersion in the initial solvant/polymer blend and the deposition of the films by spin-coating to achieve high optical quality composites.
Electro-optical characterization of the composites show an enhancement of the non-linear optical response of a poly-vinyl carbazol matrix with the incorporation of the ncSiC. The corresponding pockels coefficient may be improved through the nanoparticle properties (surface states, C/Si ratios...) and the homogeneity of their distribution in the organic matrix (concentration, global alignment of the SiC nanoparticles in the matrix under static eletric field...). Discussion of these aspects gives a better understanding of the effect in this new kind of hybrid systems.

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