1. Leibniz Institute of Photonic Technology (IPHT Jena), Albert-Einstein-Str. 9, 07745 Jena, Germany
2. Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, Sydney, NSW 2006, Australia
3. The University of Sydney Nano Institute, University of Sydney, Sydney, NSW 2006, Australia
4. Heraeus Quarzglas GmbH & Co. KG, Quarzstr. 8, 63450 Hanau, Germany
5. Abbe School of Photonics and Faculty of Physics, Max-Wien-Platz 1, 07743 Jena, Germany
6. Otto Schott Institute of Materials Research, Fraunhoferstr. 6, 07743 Jena, Germany