1. Printed Functional Solutions; VTT Technical Research Centre of Finland; Kaitoväylä 1 90571 Oulu Finland
2. Center of Microscopy and Nanotechnology; University of Oulu; PO Box 7150 90014 Oulu Finland
3. Optoelectronics and Measurement Techniques Laboratory; University of Oulu; PO Box 4500 90014 Oulu Finland