Electron rescattering at metal nanotips induced by ultrashort laser pulses

Georg Wachter, Christoph Lemell, Joachim Burgdörfer, Markus Schenk, Michael Krüger, and Peter Hommelhoff
Phys. Rev. B 86, 035402 – Published 5 July 2012

Abstract

We investigate plateau and cutoff structures in photoelectron spectra from nanoscale metal tips interacting with few-cycle near-infrared laser pulses. These hallmarks of electron rescattering, well-known from atom-laser interaction in the strong-field regime, appear at remarkably low laser intensities with nominal Keldysh parameters of the order of 10. Quantum and quasiclassical simulations reveal that a large field enhancement near the tip and the increased backscattering probability at a solid-state target play a key role. Plateau electrons are by an order of magnitude more abundant than in comparable atomic spectra, reflecting the high density of target atoms at the surface. The position of the cutoff serves as an in situ probe for the locally enhanced electric field at the tip apex.

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  • Received 2 January 2012

DOI:https://doi.org/10.1103/PhysRevB.86.035402

©2012 American Physical Society

Authors & Affiliations

Georg Wachter, Christoph Lemell, and Joachim Burgdörfer

  • Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, A-1040 Vienna, Austria, EU

Markus Schenk, Michael Krüger, and Peter Hommelhoff

  • Max Planck Institute of Quantum Optics, Hans-Kopfermann-Straße 1, D-85748 Garching, Germany, EU

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Issue

Vol. 86, Iss. 3 — 15 July 2012

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