Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Plasmonics and nanooptics I
O 3.4: Vortrag
Montag, 26. März 2012, 11:15–11:30, MA 005
Trapping light in random ZnO nanorod arrays - Localization of light in space and time — •Manfred Mascheck1, Slawa Schmidt1, Martin Silies1, David Leipold2, Erich Runge2, Takashi Yatsui3, Kokoro Kitamura3, Motoichi Ohtsu3 und Christoph Lienau1 — 1Carl-von-Ossietzky-Universität, Oldenburg — 2Technische Universität Ilmenau — 3University of Tokyo
A random array of ZnO nanorods is used to directly visualize the weak localization of light in space and time. In an ultrafast second harmonic microscope pairs of 6-fs laser pulses at variable delay are focused to the diffraction limit onto the ZnO nanorod array in a dispersion-balanced set-up. The generated SH emission is collected in reflection geometry and detected as a function of the spatial position of the laser focus as well as for the delay between the pulses. Pronounced spatial intensity fluctuations of the SH due to multiple random scattering within the array and a distinct modification of the correlated time structure of the local electric field are observed as predicted for the localization of light. By using the one parameter scaling theory the histogram of the intensity values gives evidence for being near the transition between weak- and strong localisation.