Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 76: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)

O 76.8: Talk

Wednesday, March 18, 2020, 17:15–17:30, WIL A317

Colloidal quantum dots coupled to electrically connected optical antennas — •Patrick Pertsch, René Kullock, Monika Emmerling, and Bert Hecht — NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Germany

Semiconductor quantum dots (QDs) attract a lot of interest due to their tunable light emission, high efficiency and single-photon characteristics. Combining them with optical antennas can not only lead to strong coupling [1] but also to enhanced and directional emission. To achieve that the QDs have to be positioned accurately within the antenna which, in the past, has been realized by complex and time consuming processes [2,3].

Here we report on a much simpler process, utilizing dielectrophoresis, to load the gap of electrically connected antennas with colloidal QDs. The QDs are positioned accurately inside the 30-nm gaps of the antennas, show strong photoluminescence and are promising for electro-optical applications. The reported method allows the preparation of QD-antenna systems within a few minutes.

[1] H. Groß et al., Science Advances 4, eaar4906 (2018)

[2] A. G. Curto et al., Science 329, 930-933 (2010)

[3] E. Tranvouez et al., Nanotechnology 20, 165304 (2009)