1. University of Strasbourg CNRS, ISIS UMR 7006, 8 Alleé Gaspard Monge Strasbourg F‐67000 France
2. School of Engineering and Materials ScienceQueen Mary University of London Mile End Road London E1 4NS UK
3. Centro de Investigaciones en Óptica A. C. Loma del Bosque 115, Colonia Lomas, del Campestre León Guanajuato 37150 Mexico
4. Dipartimento di Scienze ChimicheUniversità di Padova Via Marzolo, 1 Padova 35131 Italy
5. Chem&Tech—Molecular Imaging and PhotonicsKU Leuven Celestijnenlaan 200F Leuven B‐3001 Belgium
6. cMACSDepartment of Microbial and Molecular SystemsKU Leuven Celestijnenlaan, 200F Heverlee 3001 Belgium