Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Plasmonics and Nanooptics

O 36.22: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Comparing the emission quenching of electric dipole and magnetic dipole transitions near metal nanoparticles of different shapes — •Deepu Kumar¹, Dmitry Chigrin¹, Florian Hallermann¹, Alexander Sprafke², and Gero von Plessen¹ — ¹RWTH Aachen University, 52074 Aachen, Germany — ²µMD Group, Institute of Physics, Martin-Luther University Halle-Wittenberg, 06120 Halle, Germany

Near-field coupling to metal nanoparticles (MNPs) can lead to an enhancement of excitation and emission rates of molecular or ionic emitters placed in the vicinity of the particle. Magnetic dipole (MD) transitions are usually neglected in the treatment of such coupling due to their lower radiative rates as compared to electric dipole (ED) transitions. However, MD transitions appreciably contribute to some of the intra-4f transitions in rare-earth ions such as trivalent erbium (Er³⁺). We use Mie theory and the finite element method (FEM) to study the excitation and decay rates of purely ED and purely MD transitions in the close vicinity of MNPs of different shapes, such as spheres, ellipsoids and split rings acting as nanoantennas. We compare the emission quenching of ED and MD transitions in the extreme near-field regime, i.e. the close vicinity of the surface of the MNPs.