Two-color phase-controlled photoemission from a zero-dimensional nanostructure

Conference contribution


Publication Details

Author(s): Paschen T, Förster M, Krüger M, Lemell C, Wachter G, Libisch F, Madlener T, Burgdoerfer J, Hommelhoff P
Editor(s): EPJ Web Conf.
Publication year: 2019
Conference Proceedings Title: 205
Pages range: 05004


Abstract

We demonstrate that multi-photon photoemission including above-threshold
multiphoton orders from a nanotip can be coherently controlled with the
optical phase between two light fields. By focusing 74 fs drive pulses
at 1560 nm and their second harmonic at 780 nm onto the tip and changing
the optical phase between the two colors, we observe an emission
current modulation of up to 97.5 %. Additionally, electron energy
spectra reveal a homogeneous modulation of all multiphoton orders.
Hence, the electron current can be strongly increased (by a factor of
3.7) or almost completely turned off due to interference between two
different quantum channels in the material. We argue that the extremely
high degree of coherence evidenced by this near-unity current modulation
depth is due to the confinement of the local field enhancement at the
nanotip. The nano-rod effect allows to apply large DC fields, adding a
further degree of freedom to investigate the modulation contrast of the
photoemitted electron yield. We show that for an increasing DC electric
field a non-cooperative distribution of electron emission leads to a
decrease in modulation contrast.


FAU Authors / FAU Editors

Förster, Michael Dr.
Lehrstuhl für Laserphysik
Hommelhoff, Peter Prof. Dr.
Lehrstuhl für Laserphysik
Krüger, Michael
Lehrstuhl für Laserphysik
Paschen, Timo
Lehrstuhl für Laserphysik


External institutions with authors

Vienna University of Technology


How to cite

APA:
Paschen, T., Förster, M., Krüger, M., Lemell, C., Wachter, G., Libisch, F.,... Hommelhoff, P. (2019). Two-color phase-controlled photoemission from a zero-dimensional nanostructure. In EPJ Web Conf. (Eds.), 205 (pp. 05004).

MLA:
Paschen, Timo, et al. "Two-color phase-controlled photoemission from a zero-dimensional nanostructure." Proceedings of the XXI International Conference on Ultrafast Phenomena 2018 (UP 2018) Ed. EPJ Web Conf., 2019. 05004.

BibTeX: 

Last updated on 2019-05-06 at 14:50