Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Poster Tuesday: Plasmonics and Nanooptics
O 46.2: Poster
Dienstag, 2. April 2019, 18:00–20:00, Poster D
Accurate positioning of quantum dots by means of dielectrophoresis — •Patrick Pertsch1, René Kullock1, Monika Emmerling1, Noga Meir2, Dan Oron2, and Bert Hecht1 — 1NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Germany — 2Nanophotonics Laboratory, Weizmann Institute of Science, Israel
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 further enhance the emission and directionality of the radiation. To achieve that the QDs have to be positioned accurately 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 an electrically connected antenna with colloidal QDs. The dot-in-rod QDs align along the 30-nm gaps of the dimer antennas, show strong photoluminescence and are promising for electro-optical applications. This method is not restricted to the dimer antennas and allows accurate 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)