1. Fachbereich Physik and WZMW, Philipps Universität Marburg, 35037 Marburg, Germany
2. Instituto de Nanociencia de Aragon, University of Zaragoza, C/Mariano Esquillor s/n, 50018, Zaragoza, Spain
3. Bio 21 Institute & School of Chemistry, University of Melbourne, Parkville 3010, Australia
4. Department of Inorganic Chemistry, UPV/EHU, 48940 Bilbao, Spain
5. Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
6. Physik-Department and Center for NanoScience, Ludwig Maximilians Universität München, 80799 Munich, Germany
7. Martinos Center for Biomedical Imaging and the Department of Radiology, Massachusetts General Hospital, 149 13th Street, Charlestown, Massachusetts 02129, United States
8. Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
9. Department of Chemistry and Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
10. Department of Chemical Engineering, Department of Material Sciences and Engineering, Department of Biomedical Engineering, Biointerface Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
11. Centre for Cooperative Research in Biomaterials (CiC biomaGUNE), Paseo de Miramón 182, 20009 San Sebastián, Spain
12. Ikerbasque, Basque Foundation for Science, 48011 Bilbao, Spain
13. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
14. Department of Physics and Materials Science & Centre for Functional Photonics (CFP), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong S.A.R.
15. Department of Chemistry and Biochemistry, Department of Materials Science and Engineering, and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
16. Institute of Chemistry, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel