Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
BP: Fachverband Biologische Physik
BP 22: Posters - Biomaterials and Biopolymers
BP 22.2: Poster
Dienstag, 21. März 2017, 14:00–16:00, P1A
A Self-Assembled Active Plasmonic Waveguide with a Peptide-Based Thermomechanical Switch — Kilian Vogele1, Jonathan List1, Günther Pardatscher1, Nolan B. Holland2, Friedrich C. Simmel1, and •Tobias Pirzer1 — 1Systems Biophysics and Bionanotechnology E14, Physics-Department and ZNN, TU Muenchen — 2Department of Chemical and Biomedical Engineering, Cleveland State University
Nanoscale plasmonic waveguides composed of metallic nanoparticles are capable of guiding electromagnetic energy below the optical diffraction limit. Signal feed-in and readout typically requires the utilization of electronic effects or near-field optical techniques, whereas for their fabrication mainly lithographic methods are employed. Here we developed a switchable plasmonic waveguide assembled from gold nanoparticles (AuNPs) on a DNA origami structure that facilitates a simple spectroscopic excitation and readout. The waveguide is specifically excited at one end by a fluorescent dye and energy transfer is detected at the other end via the fluorescence of a second dye. The transfer distance is beyond the multi-color FRET range and below the Abbé limit. The transmittance of the waveguide can also be reversibly switched by changing the position of an AuNP within the waveguide, which is tethered to the origami platform by a thermo-responsive peptide. High yield fabrication of the plasmonic waveguides in bulk was achieved using silica particles as solid supports. Our findings enable bulk solution applications for plasmonic waveguides as light-focusing and light-polarizing elements below the diffraction limit.