1. Institute of Physics of the ASCR; v.v.i.; Cukrovarnicka 10 16253 Prague 6 Czech Republic
2. Institute of Electronics and Photonics; FEI STU; Ilkovicova 3 812 19 Bratislava Slovak Republic
3. Danubia NanoTech; s.r.o.; Ilkovicova 3 841 04 Bratislava Slovak Republic
4. STU Centre for Nanodiagnostics; Vazovova 5; 812 43 Bratislava Slovak Republic
5. Physics of Nanostructured Materials; University of Vienna; Boltzmanngasse 5 1090 Vienna Austria