Regensburg 2013 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 64: Nanomaterials - Miscellaneous

MM 64.3: Talk

Thursday, March 14, 2013, 17:45–18:00, H25

Electrically Tunable Optical Gap Antenna — •Kai Chen and Bert Hecht — Nano-Optics & Biophotonics Group, Experimentelle Physik 5, Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Optical gap antennas consist of two gold nanorods separated by gaps with a few nanometers in width. It is critical and desirable for a variety of applications to be able to actively tune the plasmon resonances of the gap antennas. Here, we demonstrated electrically tunable optical gap antennas fabricated from single crystalline gold flakes by focused ion beam (FIB). The antennas are suspended in air and hence charge accumulation induced by an applied DC voltage on the antenna results in a repulsive Coulomb force between the two nanorods leading to increased gap size. This technique provides an effective means for the fabrication of active plasmonic elements and allows to implement devices in which (nano-)optical and mechanical degrees of freedom are coupled.