1. Polish Academy of Sciences, Institute of Fundamental Technological Research, Pawińskiego 5B, 02-106 Warsaw, Poland
2. Advanced Imaging and Microscopy Laboratory, Maryland Nano Center, University of Maryland, College Park, Maryland 20742-2831, United States
3. Faculty of Science and Technology, Institute of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland