1. Optical Materials Engineering Laboratory
2. ETH Zurich
3. 8092 Zurich
4. Switzerland
5. Department of Physics
6. Chalmers University of Technology
7. 41296 Gothenburg
8. Sweden
9. Department of Chemistry
10. Nanoscience Center
11. University of Jyväskylä
12. 40014 Jyväskylä
13. Finland