1. Department of Optoelectronics, Center for Physical Sciences and Technology, Sauletekio av. 3, Vilnius 10257, Lithuania
2. Laboratory of Nanoelectromagnetics, Institute for Nuclear Problems of Belarusian State University, Bobruiskaya Str. 11, Minsk 220006, Belarus
3. Department of Organic Chemistry, Center for Physical Sciences and Technology, Sauletekio av. 3, Vilnius 10257, Lithuania
4. Department of Physics and Mathematics, Institute of Photonics, University of Eastern Finland, Yliopistokatu 7, Joensuu 80101, Finland