1. Department of Integrated Circuits and Systems, Fraunhofer Institute for Microelectronic Circuits and Systems, Duisburg, Germany
2. Department of Micro and Nanosystems, Fraunhofer Institute for Microelectronic Circuits and Systems, Duisburg, Germany
3. Mir Enterprises Ltd., London, U.K.
4. Department of Electrical Engineering, MICAS, KU Leuven, Leuven, Belgium