1. Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, Heraklion 71110, Crete, Greece
2. Department of Physics, University of Crete, Heraklion 71003, Crete, Greece
3. Department of Materials Science and Technology, University of Crete, Heraklion 71003, Crete, Greece
4. Center of Materials Technology and Photonics and Electrical Engineering Department, Technological Educational Institute (TEI) of Crete, Heraklion 71004, Crete, Greece