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DS: Fachverband Dünne Schichten
DS 56: Plasmonics and Nanophotonics O-VI (jointly with HL and O)
DS 56.3: Talk
Thursday, March 17, 2011, 11:45–12:00, WIL A317
Distinguishing between ultrafast optical harmonic generation and multi-photon-induced luminescence from ZnO thin films by interferometric frequency-resolved autocorrelation microscopy — •Slawa Schmidt1, Manfred Mascheck1, Martin Silies1, Takashi Yatsui2, Kokoro Kitamura2, Motoichi Ohtsu2, and Christoph Lienau2 — 1Carl-von-Ossietzky-Universität, Oldenburg — 2University of Tokyo
The nonlinear optical properties of a thin ZnO film are studied using interferometric frequency-resolved autocorrelation (IFRAC) microscopy. By exciting the film with 6-fs, below-bandgap laser pulses at 800nm focused to a spot size of 1 µm two emission bands in the blue and bluegreen spectral region with distinctly different coherence properties can be detected. We show that an analysis of the wavelength-dependence of the interference fringes in the IFRAC signal allows for an unambiguous assignment of these bands as coherent second harmonic emission and incoherent, multiphoton-induced photoluminescence, respectively. More generally our analysis shows that IFRAC allows for a complete characterization of the coherence properties of the nonlinear optical emission from nanostructures in a single-beam experiment. Since this technique combines a very high temporal and spatial resolution we anticipate broad applications in nonlinear nano-optics.