Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 40: [O] Plasmonics and Nanooptics V (Joint Session DS/O/HL)

DS 40.2: Talk

Thursday, March 25, 2010, 10:45–11:00, H32

Theoretical Investigation of the Electron Emission from Metal Nanotips — •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 metallic nanotips illuminated by low-power 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 of an initial value problem [3] via an exponential split-operator method and a real space product formula algorithm [4] in one and two spatial dimensions. The time-dependent electric potential used for the study of the electron emission is derived from the charge distribution on the tip apex. The electric field and the photoelectron current are compared with experimental results.

[1]

C. Ropers, D. Solli, C. Schulz, C. Lienau, and T. Elsaesser, Phys. Rev. Lett. 98, 043907 (2007).

[2]

P. Hommelhoff, C. Kealhofer, and M. Kasevich, Phys. Rev. Lett. 97, 247402 (2006).

[3]

S. Glutsch, Excitons in Low−Dimensional Semiconductors, Springer Heidelberg (2004).

[4]

H. De Raedt, Comp. Phys. Rep. 7, 1 (1987).