1. Aristotle University of Thessaloniki,Electrical and Computer Engineering,Thessaloniki,Greece,54124
2. Institute of Electronic Structure and Laser (IESL),Foundation for Research and Technology - Hellas (FORTH),Heraklion,Crete,Greece,70013
3. Fraunhofer IZM,Dept. of System Integration and Interconnection Technologies,Berlin,Germany,13355
4. Aalto University,Department of Electronics and Nanoengineering,Aalto,Finland,FI-00076