Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Plasmonics: Nanoantennas, Nanoparticles

O 5.1: Vortrag

Montag, 16. März 2015, 10:30–10:45, MA 042

Antenna-mediated single molecule FRET — •Janning Herrmann, Katharina Ditte, and Christiane Höppener — Physikalisches Institut, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

Förster Resonance Energy Transfer (FRET) is a wide-spread tool for quantitative evaluation of interaction ranges of molecular systems in single molecule studies. As the FRET efficiency is inversely proportional to the 6th power of the separation distance of donor and acceptor, it serves as a precise nanometer-ruler. Because of the high distance sensitivity, FRET is limited to the sub-8 nm range.

Optical antennas can be utilized to enhance the light-matter interactions, namely the electric field enhancement associated with the irradiated antenna, the modification of the radiative transition rate and the redirection of light [1].

In this contribution, we demonstrate in a single molecule FRET study that a single spherical AuNP antenna opens up the possibility to tune the transition rates of the donor and the acceptor ambivalently in order to boost the energy transfer rate significantly. In addition the FRET efficiency benefits also from the improved photon counting statistics in the presence of an antenna.

[1] C. Höppener and L. Novotny; Quart. Rev. Biophys. 45 (2012), 209-255