1. Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Lasers (IESL), Heraklion, Greece.
2. Biomedical Research Foundation of the Academy of Athens (BRFAA), Athens, Greece.
3. Department of Physics, University of Crete, Crete, Greece.
4. Department of Materials Science & Technology, University of Crete, Crete, Greece.