Hybrid KTP-plasmonic nanostructures for enhanced nonlinear optics at the nanoscale
Résumé
The search for miniaturized components for nonlinear optical processes needs a way to overcome the eciency loss due to the eective size reduction of the active medium. We investigate here a combination of a nanosized nonlinear dielectric crystal and metallic nanoantennas that benets from both the intrinsic nonlinear conversion eciency of the nonlinear medium and the local-eld enhancement of plasmonic resonances in metallic nanostructures. Careful comparison between experiments and numerical simulations reveals that the observed 10 to 1000 fold enhancement in Second Harmonic Generation intensity between isolated elements and their hybrid structure can be attributed unequivocally to the eld enhancement eect of plasmonic resonances on the nonlinear crystal for gold-crystal structures, while the enhancement observed in aluminum-based hybrid structures is attributed to linear dielectric eect on the plasmonic antennas.
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