[1] Univ Technol Troyes, Lab Light Nanomat & nanotechnol L2n, CNRS, EMR 7004, Troyes, France
[2] Univ Stuttgart, Inst Funct Matter & Quantum Technol, Stuttgart, Germany
[3] Univ Stuttgart, Ctr Integrated Quantum Sci & Technol IQST, Stuttgart, Germany
[4] Aix Marseille Univ, Ecole Cent Marseille, Inst Fresnel, CNRS,UMR 7249, Marseille, France
[5] Natl Inst Stand & Technol, Gaithersburg, MD USA
[6] Toshiba Europe Ltd, Cambridge, England
[7] European Mol Biol Lab, Cell Biol & Biophys Unit, Heidelberg, Germany
[8] Univ Bristol, Dept Elect & Elect Engn, Bristol, England
[9] Univ Innsbruck, Inst Expet phys, Innsbruck, Austria