Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Plasmonics and Nanooptics III: Light-Matter Interaction
O 21.4: Vortrag
Montag, 20. März 2017, 17:45–18:00, TRE Ma
Parallel mapping of optical near-field interactions by molecular motor-driven quantum dots — Friedrich W. Schwarz1, Hannah S. Heil1, Heiko Groß2, •Jens Ehrig1, Bert Hecht2, and Stefan Diez1 — 1B CUBE & cfaed, Technische Universität Dresden — 2Nano-Optics and Biophotonics Group, Universität Würzburg
Absorption and emission rates of photons by quantum emitters strongly depend on the emitters’ local environment. This enables the precise control of light–matter interactions, essential for the development of future opto-electronics devices. The design, characterization and optimization of such devices requires high-resolution, yet high-speed and non-invasive tools that allow the nm-precise mapping of the involved optical near-field interactions. Toward this end, we investigate the near-field interaction of optical dipole emitters with nanostructures by recording the fluorescence intensity of quantum dots attached to microtubules being transported across the nanostructure by molecular motors. The power of this parallel approach to near-field imaging is demonstrated by the nm-precise mapping of near-field interactions between individual quantum dots and nanoslits of 110 to 240 nm widths engraved in 25 nm gold layers. The results of these measurements are in excellent agreement with finite-difference time-domain simulations. Thus, by using a minimalistic biomolecular machinery, we are able to perform parallel superresolution mapping of near-field interactions in a virtually artifact-free fashion. We foresee broad applications, such as large-scale multi-probe imaging of meta-surfaces to further the understanding of light-matter interactions.