Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 38: Poster III: Resistive switching (jointly with DF, KR, HL); Thermoelectric materials (Focused session); Micro- and nanopatterning (jointly with O); Ion irradiation effects
DS 38.26: Poster
Donnerstag, 29. März 2012, 17:30–19:00, Poster E
Optical investigation of Au coated nanostructured surfaces — •Tammo Böntgen1, Jan Lorbeer2, Marc Teichmann2, Frank Frost2, Rüdiger Schmidt-Grund1, Michael Lorenz1, and Marius Grundmann1 — 1Universtät Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, Germany — 2Leibniz-Institut für Oberflächenmodifizierung e.V., Permoserstr. 15, Leipzig, Germany
Nanoscale ripple pattern on SiO2 and Al2O3 surfaces were formed with low-energy ion beam erosion (Eion < 2 keV) at oblique ion incidence angles. Depending on process parameters (ion species, erosion time, ion energy,) ripple pattern with different wavelengths and amplitudes are formed. Using spectroscopic ellipsometry an anisotropy in the structures optical response was found. This anisotropy is only visible if the wavelength of the light is on the same scale as the periodicity of the pattern. By coating the surface with a thin gold film, the present plasmon resonances transfer the structural anisotropy to a dielectric anisotropy. This manifests in a shift of the resonance frequency depending on the in-plane orientation of the sample. For Au plasmonic structures deposited on patterned surfaces we found a distinct resonance frequency for k parallel and perpendicular to the ripple pattern. The wavelength of the pattern also affects the strength of the anisotropy. For structures with a wavelength of ≈100 nm only a very weak anisotropy is observed whereas the anisotropy is much stronger for structures with a shorter wavelength.