1. ICube Laboratory, UMR CNRS 7357 - University of Strasbourg; 67412 Illkirch France
2. CSEM SA; Tramstrasse 99 4132 Muttenz Switzerland
3. EPFL Lausanne, Nanophotonics and Metrology Laboratory; 1015 Lausanne Switzerland
4. IGBMC institute, UMR CNRS 7104 - INSERM - University of Strasbourg; 67404 Illkirch France