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 59.35: Poster

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

Second-harmonic generation at thin gold films: Comparison of experiment and theory — •Philipp Reichenbach, Andreas Hille, Stefan Grafström, and Lukas M. Eng — Technische Universität Dresden, Institut für Angewandte Photophysik, George-Bähr-Str. 1, 01062 Dresden

The existence of optical second-harmonic generation (SHG) at metallic surfaces has been well known for a many years in experiment [1] as well as in theory, where several electron gas models exist [2-4]. Further investigations have dealt with SHG at thin metallic films [5, 6], for which these models have been compared with experimental measurements. In our work the SHG signal from thin gold films of various thicknesses was measured. The experimental results are compared with a simple and fundamental classical model: an extended Lorentz model taking second-order corrections into account. The model was implemented into a discontinuous Galerkin algorithm [7], which provides higher spatial resolution in time domain than other common methods such as FDTD and FVTD.

[1] F. Brown et al., Phys. Rev. Lett. 14, 1029 (1965)

[2] S. S. Jha, Phys. Rev. 140, A2020 (1965)

[4] J. E. Sipe et al., Phys. Rev. B 21, 4389 (1980)

[5] J. C. Quail and H. J. Simon, Phys. Rev. B 31, 4900 (1985)

[6] C. S. Chang and J. T. Lue, Surf. Sci. 393, 231 (1997)

[7] J. S. Hesthaven and T. Warburton,

Nodal Discontinuous Galerkin Methods, Springer (2008)