1. Department of Nanobiophotonics Leibniz Institute of Photonic Technology (Leibniz‐IPHT) Albert‐Einstein‐Straße 9 07745 Jena Germany
2. School of Mathematical and Physical Sciences University of New England 11 Hills Beach Road Biddeford ME 04005 USA
3. Department of Metallic Materials Otto Schott Institute of Materials Research (OSIM) Friedrich Schiller University (FSU) Löbdergraben 32 07743 Jena Germany
4. Faculty of Electrical Engineering Schmalkalden University of Applied Sciences Blechhammer 4‐9 98574 Schmalkalden Germany