Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.28: Poster
Dienstag, 1. April 2014, 18:30–22:00, P2
Plasmon Enhanced Fluorescence from Nanocrystals doped with Rare-earth Ions — •Tobia Mancabelli1, Dawid Piatkowski2, Nikolai Hartmann1, Nina Mauser1, Sebastian Mackowski2, and Achim Hartschuh1 — 1Department Chemie & CENS, Ludwig-Maximilians-University, Munich, Germany — 2Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Torun, Poland
We investigated the plasmonic enhancement of two-photon up-converted fluorescence of NaYF4:Er3+/Yb3+ nanocrystals (NCs) for two different metallic structures. First we used NCs-decorated silver nanowires (NWs): a strong enhancement of the NC emission is observed for laser polarization parallel to the orientation of the NW, indicating that the silver NW is able to locally enhance absorption. Using Fluorescence Lifetime Imaging Microscopy we then observed a faster decay dynamics for NCs close to the NW, proving that the NC-plasmon interaction can increase the radiative decay rate of the rare-earth ions. This is further supported by angular-resolved emission patterns recorded in the Fourier plane [1] showing that the NCs can relax via coupling to the NW. Second we recorded fluorescence images of NCs at sub-diffraction spatial resolution using a sharp gold antenna tip [2]. The decay dynamics in presence of the tip was found to be faster consistent with what we observe in presence of silver NWs. This shows that plasmonic metal structures can be used to enhance absorption and emission in rare-earth doped NCs. [1] N. Hartmann, et al.; ACS Nano, 11, 2013. [2] N. Mauser, et al.; Chem. Soc. Rev., 2013.