1. Institute of Quantum Optics, Gottfried Wilhelm Leibniz University Hannover Germany
2. Lower Saxony Centre for Biomedical Engineering Implant Research and Development (NIFE) Hannover Germany
3. Faculty of Electrical and Computer Engineering Laboratory of Measurement and Sensor System Technique and Competence Center Biomedical Computational Laser Systems (BIOLAS) TU Dresden Dresden Germany
4. Medical Faculty Institute of Physiology I, University of Bonn Bonn Germany
5. Faculty of Physics School of Science and Excellence Cluster Physics of Life, TU Dresden Dresden Germany