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Using ultrafast pump-probe reflectivity with 3.1 eV pump and coherent whitelight probe (1.1 to 2.6 eV), we show that graphene on gold nanostructuresexhibits a strong coupling to the plasmonic resonances of the ordered latticehole array, thus injecting a high density of hot carriers in graphene throughplasmons. The system being studied is single-layer graphene on ultrathin filmof gold with periodic arrangements of holes showing anomalous transmission. Acomparison is made with gold film with and without hole array. By selectivelyprobing transient carrier dynamics in the spectral regions corresponding toplasmonic resonances, we show efficient plasmon-induced hot carrier generationin graphene. We also show that due to high electromagnetic field intensities atthe edge of the sub-micron holes, fast decay time (10-100 fs) and short decaylength (1 nm) of plasmons, a highly confined density of hot carriers (veryclose to edge of the holes) is generated by Landau damping of plasmons withinthe holey gold film. A contribution to transient decay dynamics due todiffusion of initial non-uniform distribution of hot carriers away from thehole edges is observed. Our results are important for future applications ofnovel hot carrier device concepts where hot carriers with tunable energy can begenerated in different graphene regions connected seamlessly.

Plasmon-induced efficient hot carrier generation in graphene on gold ultrathin film with periodic array of holes: Ultrafast pump-probe spectroscopy