Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Plasmonics and nanooptics II
O 26.4: Vortrag
Dienstag, 27. März 2012, 11:15–11:30, MA 005
Electrically connected resonant optical antenna — •Jord C. Prangsma1, Martin Kamp2, Johannes Kern1, Alexander Knapp1, and Bert Hecht1 — 1Experimental Physics 5, University of Würzburg, Germany — 2Technical Physics, University of Würzburg, Germany
Interaction of quasi-static electric fields and localized plasmon resonances is of interest for various applications such as plasmon-enhanced optoelectronics and photovoltaics, electro-optical switching as well as nonlinear optics. Two-wire optical antennas provide an ideal platform for such applications since the antenna arms may in principle be used as dc electrical leads. However, when attaching electrical leads care must be taken in order to maintain the favourable resonant near-field intensity enhancement afforded by two-wire optical antennas.
Here, we propose a design that allows us to electrically connect two-wire optical antennas with hardly any effect on its bonding-mode resonance. The design provides a perfect spatial overlap between the near-field intensity enhancement region and the quasi-static electric field which is produced by applying a voltage to the connecting leads, essential for a large interaction between both in the gap region. Besides numerical studies of the structures optical response we demonstrate the fabrication of connected optical antennas on glass substrates and characterize their optical properties which are in line with the simulations. The design opens new avenues for realizing electro-plasmonic interfaces for applications in quantum optics and nonlinear optics.