1. Bio-Nanotechnology and Nanomedicine Laboratory, Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
2. Laboratory
of Semiconductor Materials, Institute of Materials, School of Engineering, EPFL, 1015 Lausanne, Switzerland
3. Center for Nanophotonics, AMOLF, Science Park 104, 1098XG Amsterdam, The Netherlands