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. Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375, USA
4. Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA
5. Electronics Science and Technology Division, Naval Research Laboratory, Washington, DC 20375, USA
6. Department of Materials Science and Technology, University of Crete, Heraklion, 71003 Crete, Greece