1. AIT Austrian Institute of Technology; Molecular Diagnostics Donau-City-Str. 1 1220 Vienna Austria
2. TU Braunschweig; Institute of Electrical Measurement and Fundamental Electrical Engineering; Hans-Sommer-Str. 66 38106 Braunschweig Germany
3. Universität des Saarlandes; Experimentalphysik, Gebäude D2 2 66401 Saarbruecken Germany
4. Bielefeld University, Department of Physics; Universitätsstrasse 25 33594 Bielefeld Germany