1 Université de Lyon, Institut des Nanotechnologie de Lyon, 69131 Ecully, France
2 Department of Electrical Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
3 School of Physics, University of Sydney, Sydney, NSW 2006, Australia
4 RMIT School of Electrical and Computer Engineering, Melbourne, VIC 3000, Australia
5 Université Côte d’Azur, CNRS, CRHEA, France
6 e-mail: Christian.grillet@ec-lyon.fr