We describe a dual-color plasmonic lens suitable for focusing two femtosecond surface plasmon polariton wavefronts to a common focal spot. We show that the overlapping evanescent fields, which are confined to (sub-) micrometer dimensions, form a surface-selective excitation volume for four-wave mixing (FWM) experiments. We demonstrate that stable and virtually background-free FWM signals from single nano-objects placed in the plasmonic focus can be generated. The plasmonic focal spot constitutes a precisely controlled excitation source for surface-selective nonlinear spectroscopic measurements.

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