[1] Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland
[2] LTM-CNRS, C/o CEA-LETI, 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France
[3] Micro Resist Technology GmbH, Koepenicker Str. 325, Haus 211, 1255, Berlin, Germany
[4] Catalan Institute of Nanotechnology, Campus de Bellaterra, Edifici CM7, Bellaterra, 08193 Barcelona, Spain
[5] Catalan Institute for Research and Advanced Studies, ICREA, 08010 Barcelona, Spain