1. Faculty of Physics, Babeş-Bolyai University, 400084 Cluj-Napoca, Romania
2. Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539 Munich, Germany
3. INCDO-INOE 2000, Research Institute for Analytical Instrumentation, 400293 Cluj-Napoca, Romania
4. Interdisciplinary Research Institute in Bio-Nano-Sciences, Babeş-Bolyai University, 400271 Cluj-Napoca, Romania