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In this talk, full time-domain hydrodynamic description of nonlinear electron dynamics in metallic nanostructures will be presented together with some vivid examples of its applications to harmonic generation on the nanoscale. The robust non-perturbalive numerical model implemented and solved, without any simplification reveals a key contribution to the nonlinear effects defined by the interplay between the topology of the nanostructure and the nonlocal response of the metal at the nanoscale. The quantum pressure term of the Fermionic gas responsible for nonlocal effects in the nonlinear hydrodynamic model leads to the emergence of fractional nonlinear harmonics and results in broadband coherent white-light generation. The investigation of Archimedean spirals, lacking any reflection and rotational symmetries, illuminated by 50 fs pulses, provides the clear signature of 6 nonlinear harmonics, favoring this structure over cylinders, as well as coherent white light generation. The described processes present a novel class of nonlinear phenomena in metallic nanostructures determined by nonlocality of electron response.
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