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HL: Fachverband Halbleiterphysik

HL 30: Hybrid systems

HL 30.1: Vortrag

Mittwoch, 28. März 2007, 14:15–14:30, H17

Nanomechanical control of an optical antenna — •Annika Zuschlag, Jörg Merlein, Matthias Kahl, Alexander Sell, Andreas Halm, Johannes Boneberg, Paul Leiderer, Alfred Leitenstorfer, and Rudolf Bratschitsch — Fachbereich Physik und Centrum für angewandte Photonik (CAP), Universität Konstanz, D-78464 Konstanz, Germany

We mechanically tune the length and feedgap of a single gold bowtie antenna by precise nanomanipulation with the tip of an atomic force microscope. The nanoantenna consists of two gold nanotriangles fabricated with a colloidal nanomask. The optical response of the nanostructure is determined via dark-field scattering spectroscopy. We find no unique single antenna resonance. Instead, the plasmon mode splits into two dipole resonances. The exact three-dimensional shape of the nanoantenna is the reason for this effect, as may be seen in discrete dipole approximation calculations of the backscattering spectra of single nanostructures with differently-shaped antenna arms.