Regensburg 2007 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 37: Nano structured materials V

MM 37.5: Vortrag

Donnerstag, 29. März 2007, 17:45–18:00, H4

SAXS charakterization of silver nanoparticles in glass — •Michael Leitner¹, Gerhard Seifert², Bogdan Sepiol¹, and Andrei Stalmashonak² — ¹Fakultät für Physik, Universität Wien, Strudlhofgasse 4, 1090 Wien — ²Institut für Physik, Optik, Martin-Luther-Universitat Halle-Wittenberg, Hoher Weg 8, Halle (Saale)

Glass samples containing silver nanoparticles are of great interest to the optical community because of their special optical properties caused by surface plasmon resonance, resulting in absorption of characteristic wavelengths. Initially spherical particles of about 30 nm diameter can be transformed to ellipsoids by femtosecond laser irradiation in the visible range, which results in optical dichroism of the sample [1]. This method allows the production of high-temperature polarisators.

Here we present SAXS-measurements on the nanoparticles’ size distribution and the shape perpendicular to the surface of the sample. The process of interest is as follows: the axis parallel to the polarisation of the laser and elongated at comparably low intensities of the laser shortens at high intensities. Moreover, we can validate the existence and the shape of holes in the matrix created by the dissolution of nanoparticles by a DC field. After the dissolution process no characteristic absorption is detectable any longer and the shape validation by optical means is impossible.

[1] M. Kaempfe, G. Seifert, K.-J. Berg, H. Hofmeister, H. Graener, Eur. Phys. J. D 16, 237-240 (2001)