Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Wednesday: Plasmonics and Nanooptics 2

O 59.2: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Access to hot electron dynamics in a nanotip via ultrafast THz-streaking — •Dominik Weber, Felix Sommer, Moritz Heindl, and Georg Herink — Experimental Physics VIII - Ultrafast Dynamics, University of Bayreuth, Germany

Field enhancement and localization of single-cycle Terahertz radiation at metallic nanotips forms the basis for a broad range of emerging ultrafast interactions - ranging from ultrafast nearfield and tunnelling microscopy, transient carrier dynamics to strong-field phenomena. We present an experimental access to ultrafast hot electron dynamics at the apex of a free-standing nanotip based on THz-nearfield streaking spectroscopy [1,2]. Using tunable fs-pulses, we induce non-equilibrium electron excitations and transient hot electron distributions. Access to local hot electron dynamics confined to the apex is provided via nonlinear sub-cycle field emission at the peak of the enhanced single-cycle THz-waveform. Based on experimental streaking waveforms, we discuss the impact of excitation conditions on hot electron relaxation and possibilities for external control of ultrafast carrier dynamics.

L. Wimmer et al., "Terahertz control of nanotip photoemission", Nature Physics 10 (2014)

G.Herink et al., "Field emission at terahertz frequencies: AC-tunneling and ultrafast carrier dynamics", New Journal of Physics 16 (2014)