1. GE Global Research; Freisinger Landstrasse 50 85748 Garching Germany
2. Institute of Microstructure Technology; Karlsruhe Institute of Technology; Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
3. Light Technology Institute; Karlsruhe Institute of Technology; Engesserstrasse 13 76131 Karlsruhe Germany