1. Istituto CNR di Scienze e Tecnologie Molecolari (ISTM-CNR), c/o Dipartimento di Chimica, Università di Perugia, Via elce di Sotto 8, I-06213, Perugia, Italy
2. Italian Institute of Technology (IIT), Center for Biomolecular Nanotechnologies, Via Barsanti, I-73010, Arnesano, Lecce, Italy
3. Laboratory for Photonics and Interfaces, Station 6, Institute of Chemical Sciences and Engineering, School of basic Sciences, Swiss Federal Institute of Technology, CH - 1015 Lausanne, Switzerland