Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 23.11: Poster

Montag, 7. März 2016, 18:15–20:30, Poster E

Simulation of electric field patterns modified by metallic nanoantennas — •Richard Kerber, Doris E. Reiter, and Tilmann Kuhn — Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany

Metallic nanoantennas are known to greatly enhance light fields and the geometry of nanoantennas influences the polarization properties of the electric field. When a nanoantenna is coupled to a semiconductor nanostructure, e.g., a quantum dot, the polarization plays an important role in the creation of electron-hole pairs. Focussing on linear and circular polarization, we perform a systematic study of nanoantennas, revealing effects of geometry on the electric field polarization. For the simulation we use the boundary element method. We consider nanoantennas consisting of gold nanostripes, which are arranged in a circle around a gap region. Different geometries are studied by varying length and number of the stripes. The impact of symmetry in a dimer nanoantenna is analyzed by changing the angle between the two nanostripes. The results show a strong dependence of the electric field on the excitation polarization and the antenna geometry.