1. Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
2. Laboratory for Fundamental BioPhotonics, Institutes of Bioengineering (IBI) and Materials Science and Engineering (IMX), School of Engineering (STI), and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
3. Faculty of Physics, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany