1. Photonics Research Group and Center for Nano- and Biophotonics (NB-Photonics); Ghent University; Technologiepark-Zwijnaarde 15 iGent 9052 Ghent Belgium
2. IBM Research-Zurich; Säumerstrasse 4 8803 Rüschlikon Switzerland
3. Physics and Chemistry of Nanostructures and Center for Nano- and Biophotonics (NB-Photonics); Ghent University; Krijgslaan 281-S3 9000 Ghent Belgium