1. Laboratory
of Optics (LO), School of Engineering (STI), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
2. Interdisciplinary Center for Electron Microscopy
(CIME), School of Basic Sciences (SB), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
3. Institute of Bioengineering (IBI) and Institute
of Chemical Sciences and Engineering (ISIC), School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
4. Institute
for Molecular Engineering, University of Chicago, Chicago, Illinois 60637 United States