1. Institute of Electronic Structure and Laser, Foundation for Research and Technology − Hellas, 700 13 Heraklion, Crete, Greece
2. Department of Physics, University of Crete, 700 13 Heraklion, Crete, Greece
3. Department of Materials Science and Technology, University of Crete, 700 13 Heraklion, Crete, Greece
4. Department of Chemistry, University of Crete, 700 13 Heraklion, Crete, Greece