1. Department of Materials, Polymer Chemistry Group; Swiss Federal Institute of Technology; ETH Zürich, HCI J 541 8093 Zürich Switzerland
2. Nanotechnology Group, ETH Zürich; Zürich Switzerland
3. Department of Chemistry; University of Nevada; Reno USA
4. Nanoscale Simulations, ETH Zürich; Zürich Switzerland
5. Laboratory of Physical Chemistry ETH Zürich; Zürich Switzerland
6. Max Planck Institute for the Science of Light; Erlangen Germany
7. Department of Chemistry “G. Ciamician”; University of Bologna; Bologna Italy
8. Laboratoire Léon Brillouin (CEA-CNRS), CEA-Saclay; CEA-Saclay 91191 Gif-sur-Yvette Cedex France