We investigated nonlinear photoemission from plasmonic films with femtosecond, mid-infrared pulses at
3.1 mm wavelength. Transition between regimes of multi-photon-induced and tunneling emission is
demonstrated at an unprecedentedly low intensity of ,1 GW/cm2
. Thereby, strong-field nanophysics can
be accessed at extremely low intensities by exploiting nanoscale plasmonic field confinement, enhancement
and ponderomotive wavelength scaling at the same time. Results agree well with quantum mechanical
modelling. Our scheme demonstrates an alternative paradigm and regime in strong-field physics.
CitationTeichmann, S. M. [et al.]. Strong-field plasmonic photoemission in the mid-IR at <1 GW/cm2 intensity. "Scientific Reports", 12 Gener 2015, vol. 5, núm. 7584.
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