1. Department of Electrical Engineering and Automation; School of Electrical Engineering; Aalto University; Otaniementie 17 Espoo 02150 Finland
2. Department of Micro- and Nanosciences; School of Electrical Engineering; Aalto University; Otaniementie 17 Espoo 02150 Finland
3. Department of Forest Products Technology; School of Chemical Technology; Aalto University; Otaniementie 17 Espoo 02150 Finland
4. Department of Applied Physics; School of Science; Aalto University; Otaniementie 17 Espoo 02150 Finland