Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Metallic Nanostructures I (on Metals)
O 66.1: Vortrag
Donnerstag, 28. Februar 2008, 12:45–13:00, MA 041
Photochemical tuning of plasmon resonances in gold nanostructures — •Thomas Härtling1, Yury Alaverdyan2, Marc Tobias Wenzel1, René Kullock1, Mikael Käll2, and Lukas M. Eng1 — 1Insitut für Angewandte Photophysik, TU Dresden, 01062 Dresden, Germany — 2Department of Applied Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden
A photochemical method for the in-situ controlled tuning of size and shape of individual gold nanostructures is presented. This novel nano-optical fabrication technique combines the top-down approach of electron beam lithography with the genuine bottom-up strategy of autocatalytic nanoparticle growth to reach highest precision in nanoscale structure manufacturing on the sub-10-nm length scale. The technique is preeminently suitable for the fabrication of spectrally optimized nano-optical antennas used for instance as SERS substrates or surface-plasmon-based biosensors. The fabrication method is demonstrated by syntonizing the localized surface plasmon resonances of sub-wavelength nanoparticles, i.e., single spheres, single and paired nanodiscs, as well as ellipsoids. We show how a distinct red- or blueshifted surface plasmon resonance can be achieved due to photochemical tuning of size and shape of the particles.