1. Chair
for Photonics and Optoelectronics, Department of Physics and Center
for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, Amalienstraße
54, 80799 Munich, Germany
2. Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 Munich, Germany
3. Chair
of Applied Physics, Department of Physics, Ludwig-Maximilians-Universität München, Amalienstraße 54, 80799 Munich, Germany
4. Department
of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven−University of Leuven, 3001 Leuven, Belgium