1. National Center of Competence for Research in Nanoscale Science (NCCR), Institute of Physics, Klingelbergstrasse 82, CH-4056 Basel, Switzerland, Nano-Optics & Biophotonics Group, Physikalisches Institut, Wilhelm-Conrad-Röntgen-Center for Complex Material Systems (RCCM), Experimentelle Physik 5, Am Hubland, 97074 Würzburg, Germany, Institut Jacques Monod, 15 Rue Hélène Brion, 75013 Paris, France, Centre for Research on Adaptive Nanostructures and Nanodevices, College Green, Dublin 2, Ireland, Department...