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We analyze ultrafast electron dynamics in the time domain upon opticalexcitation of propagating surface plasmon-polaritons (SPs) in metal-dielectricheterostructures. Developing a kinetic model where both local and non-localelectron relaxation in metals are included, we identify relevant timescales andextend the existing non-equilibrium electron dynamics framework onto the caseof collective electronic excitations. The experimental data obtained in twodistinct series of pump-probe measurements (with varied pump wavelength andangle of incidence) demonstrate SP-driven, one order of magnitude enhancedefficiency of the hot electron generation and the fourfold (up to 200 fs)slowdown of their non-local relaxation at the SP resonance. We discuss theperspectives of the SP-enabled manipulation of the non-equilibrium electronpopulation lying at the crossover of photonics and ultrafast spintronics.

Ultrafast transport and relaxation of hot plasmonic electrons in metal-dielectric heterostructures