1. School of Electrical Engineering, Department of Micro- and Nanosciences, Aalto University, Aalto, Finland
2. VTT Technical Research Centre of Finland, Finland
3. LATMOS-CNRS, Guyancourt, France
4. Fraunhofer Institute for Applied Physics (IAF), Freiburg, Germany
5. DA-Design Oy, Jokioinen, Finland
6. European Space Agency (ESTEC), Noordwijk, the Netherlands