Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 19: Plasmonics and Nanooptics II
O 19.4: Talk
Monday, March 11, 2013, 16:45–17:00, H31
In-situ mode selectivity and control in top-down fabricated optical nano-circuits — •Peter Geisler1, Gary Razinskas1, Enno Krauss1, Xiao-Fei Wu1, Christian Rewitz2, Phillip Tuchscherer2, Sebastian Goetz2, Tobias Brixner2, and Bert Hecht1 — 1Experimentelle Physik 5, Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
Plasmonic modes supported by noble-metal nanostructures offer strong sub-wavelength confinement and therefore promise the realization of nanometer-scale integrated optical circuits with well-defined functionality. The implementation of optical nanocircuitry requires the possibilities to fabricate arbitrary circuit designs as well as to selectively excite, propagate and re-emit specific eigenmodes within a circuit.
In our work we investigate the fundamental properties of micro-fabricated optical two-wire transmission lines. These structures possess two fundamental propagating modes: one that can be identified as an anti-symmetric mode with a field concentration in the gap and an symmetric mode with a mode pattern similar to the mode of a single wire. By carefully optimizing an incoupling antenna and by using well defined illumination conditions it is possible to selectively excite either of both modes. The selective detection of either mode can be achieved by spatially separating the emission spots within a unique mode-detector structure.