Foundation for Research and Technology - Hellas (FORTH) - Institute of Electronic Structure and Laser (IESL), University of Crete - Department of Materials Science and Technology, University of Crete - Department of Materials Science and Technology, University of Crete - Department of Materials Science and Technology, University of Crete - Department of Materials Science and Technology and Foundation for Research and Technology - Hellas (FORTH) - Institute of Electronic Structure and Laser (IESL)