1. Applied Physics; Hebrew University of Jerusalem; Edmond J Safra Campus; Jerusalem 919041 Israel
2. Department of Chemical and Biomolecular Engineering; University of California, Berkeley; Tan Hall 373A Berkeley CA 94720 USA
3. Laboratory for Multifunctional Materials; Department of Materials; ETH Zurich; Vladimir-Prelog-Weg 5 Zurich 8093 Switzerland
4. Department of Chemical and Biological Physics; The Weizmann Institute of Science; Rehovot 76100 Israel
5. Institute of Chemistry; Hebrew University of Jerusalem; Jerusalem 91904 Israel