[1] King Abdullah Univ Sci & Technol, Phys Sci & Engn Div, Thuwal 239556900, Saudi Arabia
[2] Univ Duisburg Essen, Fac Chem, Phys Chem 1, Univ Str 5, D-45141 Essen, Germany
[3] Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, Univ Str 5, D-45141 Essen, Germany
[4] Aix Marseille Univ, CNRS, Cent Marseille, Inst Fresnel,UMR 7249, F-13013 Marseille, France
[5] Lawrence Berkeley Natl Lab, Mol Foundry, 1 Cyclotron Rd, Berkeley, CA 94702 USA
[6] Univ Tubingen, Inst Appl Phys, Morgenstelle 10, D-72076 Tubingen, Germany
[7] Univ Tubingen, Ctr LISA, Morgenstelle 10, D-72076 Tubingen, Germany
[8] Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Mediterranean Technol Pk, Castelldefels 08860, Barcelona, Spain
[9] ICREA, Barcelona 08010, Spain
[10] Heidelberg Univ, Kirchhoff Inst Phys, Neuenheimer Feld 227, D-69120 Heidelberg, Germany
[11] CNR, IOM Inst Mat, Area Sci Pk Basovizza,SS 14 Km 163-5, I-34149 Trieste, Italy
[12] King Abdullah Univ Sci & Technol, Lab Nanomed, Div Biol & Environm Sci & Engn, 4700 KAUST, Thuwal 239556900, Saudi Arabia
[13] ASTAR, Inst Bioengn & Nanotechnol, 31 Biopolis Way,Nanos 04-01, Singapore 138669, Singapore