1. Semiconductor Photonics Group, School of Physics and CRANN Research Centre, Trinity College Dublin, Dublin 2, Ireland, Dublin Molecular Medicine Centre and Department of Clinical Medicine, Trinity College Dublin, Dublin 8, Ireland, Photonics and Optoelectronics Group, Physics Department and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, Amalienstrasse 54, 80799 Munich, Germany, and Department of Chemistry and Biochemistry and CeNS, Ludwig-Maximilians-Universität München,...