Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 57: ZnO: Optical Properties

HL 57.1: Talk

Wednesday, March 16, 2011, 14:30–14:45, POT 151

Localization of light in ZnO nano-needle arrays — •David Leipold, Christoph Minz, and Erich Runge — Technische Universität Ilmenau, 98693 Ilmenau, Germany

Localization of electromagnetic waves due to multiple scattering is an astonishing phenomenon. The strong electromagnetic fields concentrated to small spatial dimensions allow for novel ultrafast, non-linear, nano-optical experiments and applications. Recent experiments provide strong evidence for the existence of highly localized photon modes in a system of homogeneous, randomly distributed, vertically aligned ZnO nano-needles: Hot spots with hugely enhanced intensity were observed in the spatial distribution of the second harmonic generation (SHG) signal. We present results of full 3D solutions of Maxwell's equations for a model system. Several aspects of these results are quantitatively compared to experimental data.

We thank Manfred Maschek, Slawa Schmidt, Martin Silies, and Christoph Lienau from the Carl von Ossietzky Universität Oldenburg as well as Takashi Yatsui, Kokoro Kitamura and Motoichi Ohtsu from the University of Tokyo, who did the experiments which inspired this theoretical work.