1. Department of Physics and Mathematics, University of Eastern Finland, Yliopistokatu 2, P.O Box 111, FI-80101, Joensuu, Finland
2. Biohybrid Materials, Department of Bioproducts and Biosystems, Aalto University, P.O. Box 16100, FI-00076, Aalto, Finland
3. Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 17165 Stockholm, Sweden
4. LIBER Center of Excellence, Aalto University, P.O. Box 16100, FI-00076, Aalto, Finland