Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 31: Strong laser fields - II
A 31.7: Vortrag
Mittwoch, 7. März 2018, 15:45–16:00, K 2.019
Strong-field photoemission from a one-dimensional nanometric blade structure — •Timo Paschen1, Ryan Roussel2, James Rosenzweig2, and Peter Hommelhoff1,3 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2UCLA Physics and Astronomy, Los Angeles, CA 90095-1547 — 3Max-Planck Institut für die Physik des Lichts, 91058 Erlangen
We present femtosecond laser-induced electron emission from a nanometric one-dimensional blade structure. Due to the unique combination of silicon-based production technology and optical near-field properties well known from nanotip research [1,2] confined laser-induced electron emission can be achieved. By tightly focusing µJ-level few-cycle laser pulses onto the sample and harnessing local field enhancement at the structure the optical-field strength can reach up to 60 V/nm, turning the electron emission mechanism into strong-field photoemission. We will discuss energy-resolved electron spectra showing clear signs of strong-field effects such as the high-energy plateau and the intensity-dependent cut-off shift. The high total emitted charge of several thousand electrons per laser pulse and maximum achieved electron energies of more than 1 keV render the presented structure an excellent candidate as a line electron source for dielectric laser acceleration (DLA) [3], for example.
[1] M. Schenk et al., Phys. Rev. Lett., 105, 257601 (2010).
[2] M. Krüger et al., Nature 475, 78 (2011).
[3] J. Breuer et al., Phys. Rev. Lett., 111, 134803 (2013).