1. Faculty of Physics, University of Rijeka, Radmile Matejcic 2, 51000 Rijeka, Croatia
2. Center for Micro- and Nanosciences and Technologies, University of Rijeka, Radmile Matejcic 2, 51000 Rijeka, Croatia
3. Ruder Boskovic Institute, Bijenicka Cesta 54, 10000 Zagreb, Croatia