1. Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universtität (LMU), Königinstraße 10, 80539 Munich, Germany
2. Department of Pharmacy, Ludwig-Maximilians-Universtität (LMU), Butenandtstraße 5-13, 81377 Munich, Germany
3. Faculty of Physics and CeNS, Ludwig-Maximilians-Universtität (LMU), Geschwister-Scholl-Platz 1, 80539 München, Germany
4. Department of Chemical Physiology & Biochemistry, Vollum Institute, Oregon, Health & Science University, 3181 S.W. Sam Jackson Park Rd., Portland, Oregon 97239, United States
5. Department of Chemistry, New York University, Silver Center, 100 Washington Square East, Room 712, New York, New York 10003, United States