Laser-induced electron emission from a tungsten nanotip: identifying above threshold photoemission using energy-resolved laser power dependencies

Abstract

We present an experiment studying the interaction of a strongly focused 25 fs laser pulse with a tungsten nanotip, investigating the different regimes of laser-induced electron emission. We study the dependence of the electron yield with respect to the static electric field applied to the tip. Photoelectron spectra are recorded using a retarding field spectrometer and peaks separated by the photon energy are observed with a 45 % contrast. They are a clear signature of above threshold photoemission (ATP), and are confirmed by extensive spectrally resolved studies of the laser power dependence. Understanding these mechanisms opens the route to control experiment in the strong-field regime on nanoscale objects.

9 pages, 6 figures

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• Schroedinger electrons interacting with optical gratings: quantum mechanical study of the inverse Smith Purcell effect
• Efficient and accurate modeling of electron photoemission in nanostructures with TDDFT
• Femtosecond laser-induced electron emission from nanodiamond-coated tungsten needle tips
• Field Enhancement in Plasmonic Nanostructures
• Attosecond physics in optical near fields