Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 76: Plasmonics and Nanooptics VII
O 76.3: Vortrag
Donnerstag, 17. März 2011, 15:30–15:45, WIL A317
Weak localization of light in ZnO nanorods in space and time — •Manfred Mascheck1, Slawa Schmidt1, Martin Silies1, David Leipold2, Erich Runge2, Takashi Yatsui3, Kokoro Kitamura3, Motoichi Ohtsu3, and Christoph Lienau1 — 1Carl von Ossietzky Universität Oldenburg — 2Technische Universität Ilmenau — 3University of Tokyo
An array of ZnO nanorods is used to directly visualize the weak localization of light in both space and time. Ultrashort laser pulses from a Ti:Sapphire oscillator with a pulse duration of 6 fs are focused to their diffraction-limit of 1 µm2 onto the ZnO nanorod array using an all-reflective Cassegrain objective. The generated SH emission is collected in reflection geometry and detected as a function of the lateral position of the laser focus. Pronounced intensity fluctuations on a sub-µm scale due to the multiple random scattering inside the nanoneedle array are taken as the spatial hallmark of weak the localization of light. By varying the delay between the phase-stabilized pair of laser pulses from a dispersion-balanced Michelson interferometer, interferometric frequency-resolved autocorrelation (IFRAC) traces are measured. By analyzing these traces in the frequency domain, the dephasing time and therewith the temporal evolution of the electric field within the ZnO array could be deduced.