1. Aristotle University of Thessaloniki Center for Interdisciplinary Research and Innovation (CIRI-AUTH),Department of Physics,Thessaloniki,Greece
2. Hellenic Open University,Physics Laboratory, School of Science and Technology,Patras,Greece,26222
3. Aristotle University of Thessaloniki,Center of Interdisciplinary Research and Innovation (CIRI-AUTH),Department of Mech. Engineering,Thessaloniki,Greece