1. Chair of Solid Mechanics, University of Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany
2. Wuppertal Center for Smart Materials & Systems, University of Wuppertal, Rainer-Gruenter-Str. 21, 42119 Wuppertal, Germany
3. Chair of Large Area Optoelectronics, University of Wuppertal, Rainer-Gruenter-Str. 21, 42119 Wuppertal, Germany