Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Plasmonics and Nanooptics

O 59.14: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG1

Optical microspectroscopy of DNA origami-assembled complex and dynamic plasmonic nanostructures — •Mo Lu1, Markus Pfeiffer1, Chao Zhou2, Na Liu2, and Klas Lindfors11Department of Chemistry, University of Cologne, Luxemburger Str. 116, D-50939 Köln, Germany — 2Max-Planck-Institute for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany

Metal nanoparticles can serve as optical antennas due to their capacity to support collective oscillations of conduction electrons, known as localized surface plasmons. This can be used to enhance the reception and emission of light from quantum emitters such as semiconductor quantum dots or dye molecules. In our work, we study active plasmonic systems based on DNA origami nanotechnology, where a gold nanorod acts as a nanoantenna and use a single organic fluorescent dye molecule as a quantum emitter. In this system, the plasmonic nanorods can execute progressive and reversible walking to the predefined destination with a stepwise of 7nm [1]. The interaction of the light-emitting molecules with the plasmonic particles is characterized in fluorescence microscopy experiments, where we observe a decrease in fluorescence lifetime and brightness as the distance between emitter and antenna is decreased. Furthermore, we also perform interferometric scattering microscopy to detect the plasmonic particles in this active system in order to track the dynamic process in real time. Our microspectroscopy results provide evidence of the promise of merging nano-optics and DNA technology.

References [1]. C. Zhou, et al., Nat. Commun. 6, 8102 (2015).

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