Berlin 2005 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 24: Postersitzung II
DS 24.23: Poster
Dienstag, 8. März 2005, 17:00–19:00, Poster TU B
Laser-induced periodic structures in plasma polymer films with embedded metal nanoparticles — •Katrin Löschner1, Andreas Kiesow1, Andreas Heilmann1, Amin Abdolvand2, and Gerhard Seifert2 — 1Fraunhofer-Institut für Werkstoffmechanik, Heideallee 19, 06120 Halle — 2Fachbereich Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle
A laser-based method to generate grid-likely arranged line structures in thin organic films with embedded gold or silver nanoparticles is introduced. The films with a thickness of about 100 nm were deposited by alternating plasma polymerization of hexamethyldisilazane and metal evaporation to obtain a multilayer structure, i.e., all particles are arranged in one plane within the plasma polymer matrix. Irradiating these samples with linearly polarized, ultrashort (130 fs) laser pulses leads to the formation of periodically arranged, line-like areas with modified particle size and shape distribution. The films were irradiated with different laser wavelengths (800 nm, 400 nm, 528 nm, 266 nm). Transmission and scanning electron microscopy (TEM, SEM) were applied to analyze the microstructural changes. A linear dependency between the structure period and the wavelength used is observed. The direction of the particle lines correlates to the linear polarization of the laser pulses. The anisotropic structure modifications result in dichroitic film properties. The structure changes and the physical mechanism of the periodic formation are discussed.