Localized Multiphoton Emission of Femtosecond Electron Pulses from Metal Nanotips

C. Ropers, D. R. Solli, C. P. Schulz, C. Lienau, and T. Elsaesser
Phys. Rev. Lett. 98, 043907 – Published 25 January 2007

Abstract

Intense multiphoton electron emission is observed from sharp (20nm radius) metallic tips illuminated with weak 100-pJ, 7-fs light pulses. Local field enhancement, evidenced by concurrent nonlinear light generation, confines the emission to the tip apex. Electrons are emitted from a highly excited nonequilibrium carrier distribution, resulting in a marked change of the absolute electron flux and its dependence on optical power with the tip bias voltage. The strong optical nonlinearity of the electron emission allows us to image the local optical field near a metallic nanostructure with a spatial resolution of a few tens of nanometers in a novel tip-enhanced electron emission microscope.

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  • Received 4 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.043907

©2007 American Physical Society

Authors & Affiliations

C. Ropers1, D. R. Solli2, C. P. Schulz1, C. Lienau1,*, and T. Elsaesser1

  • 1Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany
  • 2Los Angeles Department of Electrical Engineering, University of California, Los Angeles, California 90095-1594, USA

  • *Present address: Carl von Ossietzky Universität Oldenburg, Institut für Physik, 26111 Oldenburg, Germany. Electronic address: christoph.lienau@uni-oldenburg.de

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Vol. 98, Iss. 4 — 26 January 2007

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