1. Center of Materials Technology and Photonics & Electrical Engineering Department, School of Applied Technology, Technological Educational Institute (TEI) of Crete Heraklion, 71004 Crete, Greece
2. Department
of Materials Science and Technology, University of Crete, Heraklion, 71003 Crete, Greece
3. University of Crete, Department of Physics, 71003 Heraklion, Crete, Greece
4. Institute of Electronic Structure & Laser (IESL), Foundation for Research and Technology (FORTH) Hellas, P.O. Box 1385, Heraklion 70013, Crete, Greece
5. Department
of Electronic Engineering, Technological Educational Institute of Crete, Romanou 3, 73100 Chania, Greece
6. Crete Center
for Quantum Complexity and Nanotechnology, Department of Physics, University of Crete, 71003 Heraklion, Greece