SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Mini-Symposium: Coherent band structure engineering with light I

O 59.6: Vortrag

Mittwoch, 3. März 2021, 12:15–12:30, R2

Time-Resolved Plasmoemission Spectromicroscopy — •Pascal Dreher, David Janoschka, Jan-Henrik Herrig, Michael Horn-von Hoegen, and Frank Meyer zu Heringdorf — Faculty of Physics and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany

Photoemission in intense light fields has received a lot of attention in the past and the coherent interaction of electrons with the field after the emission process has been revealed. Within a solid, strong nonperturbative interactions of the intense driving light field with the electronic band structure can also occur under suitable driving conditions. Ultimately, observing such dressing of electronic bands by light requires electronic state resolution as well as precise control over the intense periodic driving field.

Here, we explore nanofocusing of femtosecond surface plasmon polariton (SPP) pulses on flat surfaces in combination with time- and angle-resolved photoemission spectromicroscopy as a possible route towards strong-field control over electronic states within a solid. We observe coherent nonlinear electron emission from the Au(111) Shockely surface state into SPP-dressed free-electron final states by the absorption of up to seven SPP quanta. The ponderomotive shift of the observed electron spectra is used to determine the transient field strength in the nanofocus. We present first results on time-resolved plasmoemission spectroscopy, which provides us with direct access to the coherent nonlinear dynamics of electrons within the intense SPP nanofocus.