Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 57: Plasmonics and Nanooptics II
O 57.4: Talk
Wednesday, April 2, 2014, 16:45–17:00, GER 38
Excitation and decay rate enhancements of purely magnetic dipole transitions in Er3+ ions near gold nanoparticles — •Deepu Kumar1, Florian Hallermann1, Alexander Sprafke2, Dmitry Chigrin1, and Gero von Plessen1 — 1RWTH Aachen University, 52056 Aachen, Germany — 2µMD Group, Institute of Physics, Martin-Luther University Halle- Wittenberg, 06120 Halle, Germany
The excitation and emission rates of molecular and ionic emitters placed in the vicinity of metal nanoparticles (MNP), can be enhanced due to near-field effects of the particles. In general, magnetic-dipole (MD) transitions can be neglected as their rates are much lower than those of the electric dipole (ED) transitions. In rare-earth ions however, such as trivalent erbium (Er3+), MD transitions contribute to some of the intra-4f transitions. For the overall transition rate enhancement in Er3+ ions due to the MNP, the changes in both the ED and MD transition rates have to be taken into account. We calculate the effects of gold MNP on the excitation and decay rates of Er3+ ions by using Mie theory and the finite element method (FEM). We compare the MNP-induced decay rate changes for purely electric and purely magnetic dipoles.