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We show a large enhancement of two-photon absorption processes in nanocrystalquantum dots and of light upconversion efficiency from the IR to the near-IRspectral regime, using a hybrid optical device in which near-IR emitting InAsquantum dots were embedded on top a metallic nanoslit array. The resonantenhancement of these nonlinear optical processes is due to the strong localelectromagnetic field enhancements inside the nanoslit array structure at theextraordinary transmission resonances. A maximal two-photon absorptionenhancement of more than 20 was inferred. Different high field regions wereidentified for different polarizations, which can be used for designing andoptimizing efficient nonlinear processes in such hybrid structures. Combiningnanocrystal quantum dots with subwavelength metallic nanostructures is therforea promising way for a range of possible nonlinear optical devices.

Enhancement of two photon processes in quantum dots embedded in subwavelength metallic gratings