Financial support from the following agencies is gratefully acknowledged:
the European Research Council under the European Union's Seventh Framework Programme (ERC project LIGHT: GA-307523).
the European Union's Seventh Framework Programme for the Self-Assembly in Confined Space project.
the Research Foundation-Flanders by means of FWO grants; G.0197.11, G.0962.13, G.0983.19N, G.0861.14, G.0B39.15N, G.0B39.15 and postdoctoral fellowships.
the Hercules Foundation (HER/11/14).
the European Union's Horizon 2020 programme for the Innovative Training Networks (ITN); DEFNET and Phototrain.