Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.34: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B2

Ultrafast local dynamics of two-dimensional light modes — •David Leipold and Erich Runge — Institut für Physik, Technische Universität Ilmenau, Germany

The phenomenon of localization of waves by multiple coherent scattering attracts the interest of physical research for more than half a century. Anderson localization of matter waves is well established and a major building block of solid state physics. In contrast, the localization of classical waves – particularly light waves – is notoriously hard to observe and controversially discussed.

In this contribution, we present calculations considering the localized light field in ZnO nano-needle arrays. In particular, we investigate the influence of radiative losses on the formation of localized modes.

We compare results from numerical 2D solutions of Maxwells equations with open in-plane boundary conditions to 3D calculations including the finite needle-length and a rough substrate. The latter closely reproduce experimental findings[1] and have losses only in the out-of-plane directions. In the former, translational invariance in the out-of-plane directions suppresses these losses. Instead, losses in the in-plane directions are induced by open in-plane boundaries.

We find that modes showing mixed localized and lossy character form in the 2D case and can be distinguished by their lifetime and overlap with the vacuum region. These modes are similar to those found in the 3D calculations[1].

[1] M. Mascheck, et al., Nature Photonics 6, 293 (2012)