Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Plasmonics and Nanooptics IV

O 41.4: Vortrag

Mittwoch, 16. März 2011, 12:00–12:15, WIL A317

Characteristics of the Electron Emission from Metal Nano-tips due to Ultrashort Laser Pulses — •Steve Lenk and Erich Runge — Institut für Physik und Institut für Mikro- und Nanotechnologien, Technische Universität Ilmenau, 98693 Ilmenau, Germany

We investigate the electron emission process from sharp gold nanotips illuminated by ultrashort femtosecond laser pulses theoretically. The emission processes under discussion for few-femtosecond laser pulses are multiphoton emission [1] and optical field emission [2]. We calculate the probability current from a numerical solution in two spatial dimensions of an initial-value problem [3] via an exponential split-operator method and a real-space product-formula algorithm [4]. The time-dependent electromagnetic potentials used for the study of the electron emission are derived from a finite-difference time-domain method calculation. We observe spatial emission spot changes dependent on the bias voltage as well as different time characteristics due to different laser pulse powers. The electric field and the photoelectron current are compared to experimental results.

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