1. Laboratory of Photonics; Tampere University of Technology; FI-33101 Tampere Finland
2. Laboratory of Chemistry and Bioengineering; Tampere University of Technology; FI-33101 Tampere Finland
3. Optoelectronics Research Centre; University of Southampton; SO17 1BJ Southampton UK
4. NooEL-Nonlinear Optics and OptoElectronics Laboratory; University “Roma Tre”; IT-00146 Rome Italy