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O: Fachverband Oberflächenphysik

O 65: Plasmonics and Nanooptics IV: Waveguides and Antennas

O 65.4: Vortrag

Mittwoch, 18. März 2020, 11:15–11:30, WIL A317

Mode-selective electrical excitation of optical waveguides — •Maximilian Ochs, Luka Zurak, Enno Krauss, Jessica Meier, René Kullock, Monika Emmerling, and Bert Hecht — NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Germany

Downscaling light-based communication to the nanoscale, i.e. optical nanocircuitry, promises higher data transfer rates than currently available technologies. Waveguides, routing optical modes in a controlled way, are fundamental components in such circuits and have already been demonstrated utilizing optical excitation schemes [1]. However, the electrical driving - necessary to integrate these devices into common circuits and reduce their footprint - still remains a challenge.

Here, we demonstrate the mode-selective electrical excitation of optical waveguides using inelastic electron tunneling. The tunnel gap is fabricated with high accuracy and reproducibility by combining helium ion milled single-crystalline gold flakes and feedback-controlled dielectrophoresis [2]. Based on the position of excitation, specific modes can be launched and their interference enables control over the polarization of the out-coupled light. In this context, we propose an integrated system allowing to switch between the excitation of two different modes. This work paves the road for more complex optical nanocircuits, such as logic gates at optical frequencies.
[1] E. Krauss et al.,Nano Lett. 19, 3364 (2019)
[2] R. Kullock et al.,Nat. Commun. accepted (2019)