1. Department of Electrical and Computer Engineering, University of Cyprus (UCY), Nicosia, Cyprus
2. Institute of Electronic Structure and Laser, Foundation for Research and Technology–Hellas (FORTH), Heraklion, Greece
3. Department of Electronics and Nanoengineering, Aalto University, Aalto, Finland
4. Fraunhofer Institute for Reliability and Microintegration (IZM), Berlin, Germany
5. Department of Electrical and Computer Engineering, University of Massachusetts at Amherst, Amherst, MA, USA