1. Laboratory of Bio-Nano-Photonics, Department of Physics “Ettore Pancini”, University of Naples “Federico II”, Naples, Italy
2. Instituto Statale d'Instruzione Superiore Leonardo da Vinci, Naples, Italy
3. Department of Pharmacy, University of Salerno, Fisciano, Italy
4. Laboratory of Bio-Nano-Photonics, Department of Advanced Biomedical Sciences, University of Naples Federico II, Naples, Italy
5. Istituto Nazionale di Fisica Nucleare, Naples, Italy