1. Institute of Electrical Engineering, Slovak Academy of Sciences, 841 04 Bratislava, Slovakia
2. Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48 Bratislava, Slovakia
3. Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia
4. Centre for Advanced Materials Application, SAS, Dúbravská cesta 5807/9, 845 11 Bratislava, Slovakia