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 36.25: Poster

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

Resonances and radiation patterns of metal-dielectric nanoantennas — •Manuel Gonçalves and Othmar Marti — Ulm University - Institute of Experimental Physics, Ulm, Germany

Plasmonic nanoantennas have been used to enhanced near-fields and scatter light emitted by small light sources at specific directions. However their radiation patterns are much more complex than classical antennas. Recently, materials of large refractive index were proposed for building antennas using the strong directivity of spectral well separated magnetic resonance modes. Silicon is one of the preferred candidates for such applications. On the other hand, destructive interferences between plasmonic radiant modes (bright plasmons) and subradiant modes (dark plasmons), as for magnetic dipoles and electric quadrupoles, in near-field coupled particles, leads to Fano resonances.

Using finite-element method (FEM) we study systems of plasmonic and dielectric particles presenting strong directivity, required for nanoantennas. We show how the Fano resonances can arise and their sensitivity on the particle size, environment and interparticle separation.