Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 18: Interaction with strong or short laser pulses II

A 18.7: Talk

Tuesday, March 18, 2014, 15:45–16:00, BEBEL E34

Field-driven THz-streaking of Nanotip Photoemission — •Georg Herink, Lara Wimmer, Katharina E. Echternkamp, Daniel R. Solli, and Claus Ropers — 4. Physical Institute - University of Göttingen, Göttingen, Germany

We present an ultrafast, nanoscale streaking scheme for field-driven photoemission control using single-cycle THz transients at the apex of a sharp gold tip [1]. The locally enhanced THz-field allows for a high-contrast enhancement or suppression of the near-infrared photoemission yield and a tuning of the photoelectron kinetic energy distribution, both in spectral position and width.

This streaking scheme is unique to nanostructures because of the strong sub-wavelength confinement of the driving field [2]. In particular, the associated electron dynamics are governed by the momentary THz field at the instance of photoemission, rather than by a temporal integral, i.e. the vector potential, as in optical streaking experiments for attosecond spectroscopy [3].

Besides the fundamental interest in the characterization and control of electron trajectories within ultrashort optical near-fields, the approach carries significant potential for pulse compression in ultrafast electron diffraction and microscopy experiments.

[1] Wimmer et al., arXiv: 1307:2581 (2013)

[2] Herink et al., Nature 483, 190-193 (2012)

[3] Corkum, Krausz, Nature Physics 3, 381 - 387 (2007)