Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Thin Films

CPP 6.4: Vortrag

Montag, 23. März 2009, 14:45–15:00, ZEU 160

Brillouin spectroscopy on thin polymer films — •Johannes Wiedersich, Alexander Diethert, Peter Müller-Buschbaum, and Winfried Petry — Physikdepartment E13, TU München, Garching

Conventional Brillouin light scattering spectroscopy is a versatile tool for the contact free investigation of mechanical properties of polymers. This makes Brillouin scattering an interesting method for the investigation of thin films, where contact methods have difficulties discerning contributions from the thin film and the substrate. Substantial progress of the Brillouin light scattering technique allows acquisition from scattering volumes in the femto litre range, and thus from films merely tens of nm thick.

We present our first results on Brillouin spectroscopy on thin, transparent polymer films on a glass substrate. Depending on the sample thickness (in the range from less than 100 nm up to bulk dimensions) we observe several film-guided phonons, propagating parallel to the surface.