Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)

O 59.45: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

One-dimensional analytical model for strong-field photoelectron emission from metal nanostructures — •Sergey Yalunin, Reiner Bormann, Alexander Weismann, Max Gulde, and Claus Ropers — University of Göttingen, Courant Research Center Nano-Spectroscopy and X-Ray Imaging, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Ultrashort electron pulse generation from nanostructures has attracted significant interest, due to its potential for time-resolved electron experimentation. Alongside numerical models of the associated nonlinear emission processes, an analytical model can provide important insight in the physical principles.

Here, we present an analytical quantum mechanical model for nonlinear photoelectron emission that takes into account multiple emission channels. The model describes both multiphoton and optical field (i.e. tunneling) emission in the presence of arbitrary static and laser fields. Several limiting cases are correctly reproduced. In the multiphoton regime and without a static field, the model yields the usual power law for the emission current. In the absence of a laser field, the Fowler-Nordheim equation is obtained. For the optical tunnel regime, the results coincide with the adiabatic approximation.