1. Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
2. IEK-5 Photovoltaik, Forschungszentrum Jülich, 52425 Jülich, Germany
3. Faculty of Engineering and CENIDE, University of Duisburg-Essen, Carl-Benz-Str. 199, 47057 Duisburg, Germany
4. Department of Materials and Interfaces, Weizmann Institute of Science, Rehovoth 76100, Israel
5. Department of Chemistry and Bar-Ilan Institute of Nanotechnology and Advanced Material, Bar-Ilan University, 5290002 Ramat Gan, Israel
6. Department of Physics and Astronomy, VU Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, the Netherlands