1. Gebze Institute of Technology; Department of Physics Gebze; Kocaeli Turkey
2. Tubitak - UME, Photonic and Electronic Sensor Laboratory; PK.54, 41470 Gebze Kocaeli Turkey
3. Functional Polymers Group and Institute of Polymer Technology, University of Wuppertal; Gaußstr. 20, D-42097 Wuppertal Germany
4. Dutch Polymer Institute (DPI); P.O. Box 513, NL-5600 AX Eindhoven The Netherlands