Nonadiabatic ponderomotive effects in photoemission from nanotips in intense midinfrared laser fields

Schoetz J, Mitra S, Fuest H, Neuhaus M, Okell WA, Förster M, Paschen T, Ciappina MF, Yanagisawa H, Wnuk P, Hommelhoff P, Kling MF (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Physical Review A American Physical Society

Book Volume: 97

Article Number: 013413

URI: https://arxiv.org/abs/1905.06079

DOI: 10.1103/PhysRevA.97.013413

Abstract

Transient near fields around metallic nanotips drive many applications, including the generation of ultrafast electron pulses and their use in electron microscopy. We have investigated the electron emission from a gold nanotip driven by midinfrared few-cycle laser pulses. We identify a low-energy peak in the kinetic energy spectrum and

study its shift to higher energies with increasing laser intensities from 1.7 to 8.9×10¹¹ W/cm². The experimental observation of the upshift of the low-energy peak is compared to a simple model and numerical simulations, which show that the decay of the near field on a nanometer scale results in nonadiabatic transfer of the ponderomotive potential to the kinetic energy of emitted electrons and in turn to a shift of the peak. We derive an analytic expression for the nonadiabatic ponderomotive shift, which, after the previously found quenching of the quiver motion, com-

pletes the understanding of the role of inhomogeneous fields in strong-field photoemission from nanostructures.

Authors with CRIS profile

Michael Förster Lehrstuhl für Laserphysik Timo Paschen Lehrstuhl für Laserphysik Peter Hommelhoff Lehrstuhl für Laserphysik

Involved external institutions

Max-Planck-Institute of Quantum Optics (MPQ) / Max-Planck-Institut für Quantenoptik

Germany (DE)

How to cite

APA:

Schoetz, J., Mitra, S., Fuest, H., Neuhaus, M., Okell, W.A., Förster, M.,... Kling, M.F. (2018). Nonadiabatic ponderomotive effects in photoemission from nanotips in intense midinfrared laser fields. Physical Review A, 97. https://doi.org/10.1103/PhysRevA.97.013413

MLA:

Schoetz, Johannes, et al. "Nonadiabatic ponderomotive effects in photoemission from nanotips in intense midinfrared laser fields." Physical Review A 97 (2018).

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