1. Advanced Research Center on Electronic System (ARCES), University of Bologna, Bologna, Italy
2. Systems for Condition Monitoring, Fraunhofer Institute for Ceramic Technologies and Systems (IKTS), Dresden, Germany
3. Department of Physics, Terahertz/Photonics, Goethe University of Frankfurt am Main, Frankfurt, Germany
4. Systems for Condition Monitoring, Fraunhofer Institute for Ceramic Technologies and Sintered Materials, Dresden, Germany
5. Department of Electronics, Computer Sciences and Systems (DEIS), University of Bologna, Bologna, Italy