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DS: Fachverband Dünne Schichten

DS 16: Layer Properties: Electrical, Optical, and Mechanical

DS 16.2: Vortrag

Dienstag, 8. März 2016, 09:45–10:00, H11

Ultrafast dynamics of coherent acoustic phonons in thin gold films investigated by surface plasmon resonance — •Felix Noll, Nico Krauß, and Thomas Dekorsy — Universität Konstanz, Fachbereich Physik, Konstanz, Germany

Coherent acoustic phonons are studied in pump-probe experiments with femtosecond temporal resolution and shot-noise limited detection sensitivity [1]. The measured photo-induced differential reflectivity change is expected to increase by several orders of magnitude when probing under surface plasmon resonance (SPR) condition [2].

In this work, high-speed asynchronous optical sampling is combined with SPR in Kretschmann geometry for highly sensitive pump-probe experiments on gold films with thicknesses ranging from 30 nm to 50 nm. Angular resolved transients yield parameters for optimum enhancement of the coherent acoustic phonons. The fundamental thickness oscillations and their higher harmonics are discussed with regard to frequency and damping time.

[1] Bartels, A. et al., Rev. Sci. Instrum. 78, 035107 (2007)

[2] Wang, J. et al., Opt. Lett. 32, 719-721 (2007)